diff --git a/crates/disk/src/eventchunker.rs b/crates/disk/src/eventchunker.rs
index b21dec3..39c032b 100644
--- a/crates/disk/src/eventchunker.rs
+++ b/crates/disk/src/eventchunker.rs
@@ -140,7 +140,7 @@ impl EventChunker {
 
     // TODO   `expand` flag usage
     pub fn from_start(
-        inp: Pin<Box<dyn Stream<Item = Result<FileChunkRead, Error>> + Send>>,
+        inp: Pin<Box<dyn Stream<Item = Result<FileChunkRead, items_0::streamitem::SitemErrTy>> + Send>>,
         fetch_info: SfChFetchInfo,
         range: NanoRange,
         stats_conf: EventChunkerConf,
diff --git a/crates/disk/src/merge/mergedblobsfromremotes.rs b/crates/disk/src/merge/mergedblobsfromremotes.rs
index f4c6c10..2f939c1 100644
--- a/crates/disk/src/merge/mergedblobsfromremotes.rs
+++ b/crates/disk/src/merge/mergedblobsfromremotes.rs
@@ -1,7 +1,8 @@
-use err::Error;
 use futures_util::pin_mut;
 use futures_util::Stream;
 use futures_util::StreamExt;
+use futures_util::TryFutureExt;
+use items_0::streamitem::sitem_err2_from_string;
 use items_0::streamitem::Sitemty;
 use items_2::eventfull::EventFull;
 use items_2::merger::Merger;
@@ -16,7 +17,7 @@ use std::task::Poll;
 use streams::tcprawclient::x_processed_event_blobs_stream_from_node;
 
 type T001<T> = Pin<Box<dyn Stream<Item = Sitemty<T>> + Send>>;
-type T002<T> = Pin<Box<dyn Future<Output = Result<T001<T>, Error>> + Send>>;
+type T002<T> = Pin<Box<dyn Future<Output = Result<T001<T>, items_0::streamitem::SitemErrTy>> + Send>>;
 
 pub struct MergedBlobsFromRemotes {
     tcp_establish_futs: Vec<T002<EventFull>>,
@@ -32,6 +33,7 @@ impl MergedBlobsFromRemotes {
         let mut tcp_establish_futs = Vec::new();
         for node in &cluster.nodes {
             let f = x_processed_event_blobs_stream_from_node(subq.clone(), node.clone(), ctx.clone());
+            let f = f.map_err(sitem_err2_from_string);
             let f: T002<EventFull> = Box::pin(f);
             tcp_establish_futs.push(f);
         }
diff --git a/crates/disk/src/raw/conn.rs b/crates/disk/src/raw/conn.rs
index 29832dd..dcef738 100644
--- a/crates/disk/src/raw/conn.rs
+++ b/crates/disk/src/raw/conn.rs
@@ -73,7 +73,7 @@ pub async fn make_event_pipe(
         128
     };
     let event_blobs = EventChunkerMultifile::new(
-        (&range).try_into()?,
+        (&range).try_into().map_err(Error::from_string)?,
         fetch_info.clone(),
         ncc.node.clone(),
         ncc.ix,
@@ -129,7 +129,7 @@ pub fn make_event_blobs_pipe_real(
     let range = subq.range();
     let event_chunker_conf = EventChunkerConf::new(ByteSize::from_kb(1024));
     let event_blobs = make_event_blobs_stream(
-        range.try_into()?,
+        range.try_into().map_err(Error::from_string)?,
         fetch_info.clone(),
         one_before,
         event_chunker_conf,
diff --git a/crates/items_0/src/collect_s.rs b/crates/items_0/src/collect_s.rs
index 3f8252a..fcf1d83 100644
--- a/crates/items_0/src/collect_s.rs
+++ b/crates/items_0/src/collect_s.rs
@@ -20,7 +20,7 @@ pub trait ToJsonBytes {
 }
 
 pub trait ToJsonResult: fmt::Debug + AsAnyRef + AsAnyMut + Send {
-    fn to_json_value(&self) -> Result<serde_json::Value, Error>;
+    fn to_json_value(&self) -> Result<serde_json::Value, serde_json::Error>;
 }
 
 impl AsAnyRef for serde_json::Value {
@@ -36,7 +36,7 @@ impl AsAnyMut for serde_json::Value {
 }
 
 impl ToJsonResult for serde_json::Value {
-    fn to_json_value(&self) -> Result<serde_json::Value, Error> {
+    fn to_json_value(&self) -> Result<serde_json::Value, serde_json::Error> {
         Ok(self.clone())
     }
 }
@@ -50,7 +50,7 @@ impl ToJsonBytes for serde_json::Value {
 pub trait CollectedDyn: fmt::Debug + TypeName + Send + AsAnyRef + WithLen + ToJsonResult {}
 
 impl ToJsonResult for Box<dyn CollectedDyn> {
-    fn to_json_value(&self) -> Result<serde_json::Value, Error> {
+    fn to_json_value(&self) -> Result<serde_json::Value, serde_json::Error> {
         ToJsonResult::to_json_value(self.as_ref())
     }
 }
diff --git a/crates/items_2/src/binning/container_bins.rs b/crates/items_2/src/binning/container_bins.rs
index 886d484..31059eb 100644
--- a/crates/items_2/src/binning/container_bins.rs
+++ b/crates/items_2/src/binning/container_bins.rs
@@ -450,7 +450,7 @@ impl<EVT> ToJsonResult for ContainerBinsCollectorOutput<EVT>
 where
     EVT: EventValueType,
 {
-    fn to_json_value(&self) -> Result<serde_json::Value, err::Error> {
+    fn to_json_value(&self) -> Result<serde_json::Value, serde_json::Error> {
         let bins = &self.bins;
         let ts1sns: Vec<_> = bins.ts1s.iter().map(|x| x.ns()).collect();
         let ts2sns: Vec<_> = bins.ts2s.iter().map(|x| x.ns()).collect();
@@ -471,8 +471,7 @@ where
             maxs,
             avgs,
         };
-        let ret = serde_json::to_value(&val).map_err(err::Error::from_string);
-        ret
+        serde_json::to_value(&val)
     }
 }
 
diff --git a/crates/items_2/src/binsdim0.rs b/crates/items_2/src/binsdim0.rs
index 5f56638..8cc4ee1 100644
--- a/crates/items_2/src/binsdim0.rs
+++ b/crates/items_2/src/binsdim0.rs
@@ -731,8 +731,8 @@ impl<NTY> BinsDim0CollectedResult<NTY> {
 }
 
 impl<NTY: ScalarOps> ToJsonResult for BinsDim0CollectedResult<NTY> {
-    fn to_json_value(&self) -> Result<serde_json::Value, Error> {
-        serde_json::to_value(self).map_err(Error::from_string)
+    fn to_json_value(&self) -> Result<serde_json::Value, serde_json::Error> {
+        serde_json::to_value(self)
     }
 }
 
diff --git a/crates/items_2/src/binsxbindim0.rs b/crates/items_2/src/binsxbindim0.rs
index 3eee9da..136768f 100644
--- a/crates/items_2/src/binsxbindim0.rs
+++ b/crates/items_2/src/binsxbindim0.rs
@@ -361,8 +361,8 @@ impl<NTY> BinsXbinDim0CollectedResult<NTY> {
 }
 
 impl<NTY: ScalarOps> ToJsonResult for BinsXbinDim0CollectedResult<NTY> {
-    fn to_json_value(&self) -> Result<serde_json::Value, Error> {
-        serde_json::to_value(self).map_err(Error::from_string)
+    fn to_json_value(&self) -> Result<serde_json::Value, serde_json::Error> {
+        serde_json::to_value(self)
     }
 }
 
diff --git a/crates/items_2/src/channelevents.rs b/crates/items_2/src/channelevents.rs
index a297c74..457110c 100644
--- a/crates/items_2/src/channelevents.rs
+++ b/crates/items_2/src/channelevents.rs
@@ -1023,8 +1023,8 @@ impl WithLen for ChannelEventsCollectorOutput {
 }
 
 impl items_0::collect_s::ToJsonResult for ChannelEventsCollectorOutput {
-    fn to_json_value(&self) -> Result<serde_json::Value, ::err::Error> {
-        serde_json::to_value(self).map_err(::err::Error::from_string)
+    fn to_json_value(&self) -> Result<serde_json::Value, serde_json::Error> {
+        serde_json::to_value(self)
     }
 }
 
diff --git a/crates/items_2/src/eventsdim0.rs b/crates/items_2/src/eventsdim0.rs
index 8aeadc6..b5cde68 100644
--- a/crates/items_2/src/eventsdim0.rs
+++ b/crates/items_2/src/eventsdim0.rs
@@ -371,8 +371,8 @@ impl<STY: ScalarOps> WithLen for EventsDim0CollectorOutput<STY> {
 }
 
 impl<STY: ScalarOps> ToJsonResult for EventsDim0CollectorOutput<STY> {
-    fn to_json_value(&self) -> Result<serde_json::Value, Error> {
-        serde_json::to_value(self).map_err(Error::from_string)
+    fn to_json_value(&self) -> Result<serde_json::Value, serde_json::Error> {
+        serde_json::to_value(self)
     }
 }
 
diff --git a/crates/items_2/src/eventsdim0enum.rs b/crates/items_2/src/eventsdim0enum.rs
index 38b08b3..babe914 100644
--- a/crates/items_2/src/eventsdim0enum.rs
+++ b/crates/items_2/src/eventsdim0enum.rs
@@ -120,7 +120,7 @@ impl TypeName for EventsDim0EnumCollectorOutput {
 }
 
 impl ToJsonResult for EventsDim0EnumCollectorOutput {
-    fn to_json_value(&self) -> Result<serde_json::Value, Error> {
+    fn to_json_value(&self) -> Result<serde_json::Value, serde_json::Error> {
         todo!()
     }
 }
diff --git a/crates/items_2/src/eventsdim1.rs b/crates/items_2/src/eventsdim1.rs
index 4e7bbe3..4158cc1 100644
--- a/crates/items_2/src/eventsdim1.rs
+++ b/crates/items_2/src/eventsdim1.rs
@@ -334,8 +334,8 @@ impl<STY: ScalarOps> WithLen for EventsDim1CollectorOutput<STY> {
 }
 
 impl<STY: ScalarOps> ToJsonResult for EventsDim1CollectorOutput<STY> {
-    fn to_json_value(&self) -> Result<serde_json::Value, Error> {
-        serde_json::to_value(self).map_err(Error::from_string)
+    fn to_json_value(&self) -> Result<serde_json::Value, serde_json::Error> {
+        serde_json::to_value(self)
     }
 }
 
diff --git a/crates/items_2/src/eventsxbindim0.rs b/crates/items_2/src/eventsxbindim0.rs
index 0419ac7..b79ad77 100644
--- a/crates/items_2/src/eventsxbindim0.rs
+++ b/crates/items_2/src/eventsxbindim0.rs
@@ -652,8 +652,8 @@ impl<NTY> ToJsonResult for EventsXbinDim0CollectorOutput<NTY>
 where
     NTY: ScalarOps,
 {
-    fn to_json_value(&self) -> Result<serde_json::Value, Error> {
-        serde_json::to_value(self).map_err(Error::from_string)
+    fn to_json_value(&self) -> Result<serde_json::Value, serde_json::Error> {
+        serde_json::to_value(self)
     }
 }
 
diff --git a/crates/items_2/src/framable.rs b/crates/items_2/src/framable.rs
index f7466da..d34d407 100644
--- a/crates/items_2/src/framable.rs
+++ b/crates/items_2/src/framable.rs
@@ -4,7 +4,6 @@ use crate::frame::make_log_frame;
 use crate::frame::make_range_complete_frame;
 use crate::frame::make_stats_frame;
 use bytes::BytesMut;
-use err::Error;
 use items_0::framable::FrameTypeInnerDyn;
 use items_0::framable::FrameTypeInnerStatic;
 use items_0::streamitem::LogItem;
@@ -26,6 +25,27 @@ pub const INMEM_FRAME_HEAD: usize = 20;
 pub const INMEM_FRAME_FOOT: usize = 4;
 pub const INMEM_FRAME_MAGIC: u32 = 0xc6c3b73d;
 
+#[derive(Debug, thiserror::Error)]
+#[cstm(name = "ItemFramable")]
+pub enum Error {
+    Msg(String),
+    DummyError,
+    Frame(#[from] crate::frame::Error),
+}
+
+struct ErrMsg<E>(E)
+where
+    E: ToString;
+
+impl<E> From<ErrMsg<E>> for Error
+where
+    E: ToString,
+{
+    fn from(value: ErrMsg<E>) -> Self {
+        Self::Msg(value.0.to_string())
+    }
+}
+
 pub trait FrameTypeStatic {
     const FRAME_TYPE_ID: u32;
 }
@@ -78,14 +98,16 @@ where
         match self {
             Ok(StreamItem::DataItem(RangeCompletableItem::Data(k))) => {
                 let frame_type_id = k.frame_type_id();
-                make_frame_2(self, frame_type_id)
+                make_frame_2(self, frame_type_id).map_err(Error::from)
             }
-            Ok(StreamItem::DataItem(RangeCompletableItem::RangeComplete)) => make_range_complete_frame(),
-            Ok(StreamItem::Log(item)) => make_log_frame(item),
-            Ok(StreamItem::Stats(item)) => make_stats_frame(item),
+            Ok(StreamItem::DataItem(RangeCompletableItem::RangeComplete)) => {
+                make_range_complete_frame().map_err(Error::from)
+            }
+            Ok(StreamItem::Log(item)) => make_log_frame(item).map_err(Error::from),
+            Ok(StreamItem::Stats(item)) => make_stats_frame(item).map_err(Error::from),
             Err(e) => {
                 info!("calling make_error_frame for [[{e}]]");
-                make_error_frame(e)
+                make_error_frame(e).map_err(Error::from)
             }
         }
     }
@@ -186,7 +208,7 @@ fn test_frame_log() {
 fn test_frame_error() {
     use crate::channelevents::ChannelEvents;
     use crate::frame::json_from_slice;
-    let item: Sitemty<ChannelEvents> = Err(Error::with_msg_no_trace(format!("dummy-error-message")));
+    let item: Sitemty<ChannelEvents> = items_0::streamitem::sitem_err_from_string("dummyerror");
     let buf = Framable::make_frame_dyn(&item).unwrap();
     let len = u32::from_le_bytes(buf[12..16].try_into().unwrap());
     let tyid = u32::from_le_bytes(buf[8..12].try_into().unwrap());
@@ -194,5 +216,5 @@ fn test_frame_error() {
         panic!("bad tyid");
     }
     eprintln!("buf len {}  len {}", buf.len(), len);
-    let item2: Error = json_from_slice(&buf[20..20 + len as usize]).unwrap();
+    let item2: items_0::streamitem::SitemErrTy = json_from_slice(&buf[20..20 + len as usize]).unwrap();
 }
diff --git a/crates/items_2/src/frame.rs b/crates/items_2/src/frame.rs
index 1ca32fa..407dc7f 100644
--- a/crates/items_2/src/frame.rs
+++ b/crates/items_2/src/frame.rs
@@ -13,7 +13,6 @@ use bincode::config::WithOtherTrailing;
 use bincode::DefaultOptions;
 use bytes::BufMut;
 use bytes::BytesMut;
-use err::Error;
 use items_0::bincode;
 use items_0::streamitem::LogItem;
 use items_0::streamitem::StatsItem;
@@ -27,6 +26,37 @@ use serde::Serialize;
 use std::any;
 use std::io;
 
+#[derive(Debug, thiserror::Error)]
+#[cstm(name = "ItemFrame")]
+pub enum Error {
+    TooLongPayload(usize),
+    UnknownEncoder(u32),
+    #[error("BufferMismatch({0}, {1}, {2})")]
+    BufferMismatch(u32, usize, u32),
+    #[error("TyIdMismatch({0}, {1})")]
+    TyIdMismatch(u32, u32),
+    Msg(String),
+    Bincode(#[from] Box<bincode::ErrorKind>),
+    RmpEnc(#[from] rmp_serde::encode::Error),
+    RmpDec(#[from] rmp_serde::decode::Error),
+    ErasedSerde(#[from] erased_serde::Error),
+    Postcard(#[from] postcard::Error),
+    SerdeJson(#[from] serde_json::Error),
+}
+
+struct ErrMsg<E>(E)
+where
+    E: ToString;
+
+impl<E> From<ErrMsg<E>> for Error
+where
+    E: ToString,
+{
+    fn from(value: ErrMsg<E>) -> Self {
+        Self::Msg(value.0.to_string())
+    }
+}
+
 pub fn bincode_ser<W>(
     w: W,
 ) -> bincode::Serializer<
@@ -54,7 +84,7 @@ where
 {
     let mut out = Vec::new();
     let mut ser = bincode_ser(&mut out);
-    item.serialize(&mut ser).map_err(|e| format!("{e}"))?;
+    item.serialize(&mut ser)?;
     Ok(out)
 }
 
@@ -68,14 +98,14 @@ where
         .with_fixint_encoding()
         .reject_trailing_bytes();
     let mut de = bincode::Deserializer::from_slice(buf, opts);
-    <T as serde::Deserialize>::deserialize(&mut de).map_err(|e| format!("{e}").into())
+    <T as serde::Deserialize>::deserialize(&mut de).map_err(Into::into)
 }
 
 fn msgpack_to_vec<T>(item: T) -> Result<Vec<u8>, Error>
 where
     T: Serialize,
 {
-    rmp_serde::to_vec_named(&item).map_err(|e| format!("{e}").into())
+    rmp_serde::to_vec_named(&item).map_err(Error::from)
 }
 
 fn msgpack_erased_to_vec<T>(item: T) -> Result<Vec<u8>, Error>
@@ -86,8 +116,7 @@ where
     {
         let mut ser1 = rmp_serde::Serializer::new(&mut out).with_struct_map();
         let mut ser2 = <dyn erased_serde::Serializer>::erase(&mut ser1);
-        item.erased_serialize(&mut ser2)
-            .map_err(|e| Error::from(format!("{e}")))?;
+        item.erased_serialize(&mut ser2)?;
     }
     Ok(out)
 }
@@ -96,14 +125,14 @@ fn msgpack_from_slice<T>(buf: &[u8]) -> Result<T, Error>
 where
     T: for<'de> serde::Deserialize<'de>,
 {
-    rmp_serde::from_slice(buf).map_err(|e| format!("{e}").into())
+    rmp_serde::from_slice(buf).map_err(Error::from)
 }
 
 fn postcard_to_vec<T>(item: T) -> Result<Vec<u8>, Error>
 where
     T: Serialize,
 {
-    postcard::to_stdvec(&item).map_err(|e| format!("{e}").into())
+    postcard::to_stdvec(&item).map_err(Error::from)
 }
 
 fn postcard_erased_to_vec<T>(item: T) -> Result<Vec<u8>, Error>
@@ -117,31 +146,30 @@ where
     {
         let mut ser2 = <dyn erased_serde::Serializer>::erase(&mut ser1);
         item.erased_serialize(&mut ser2)
-    }
-    .map_err(|e| Error::from(format!("{e}")))?;
-    let ret = ser1.output.finalize().map_err(|e| format!("{e}").into());
-    ret
+    }?;
+    let ret = ser1.output.finalize()?;
+    Ok(ret)
 }
 
 pub fn postcard_from_slice<T>(buf: &[u8]) -> Result<T, Error>
 where
     T: for<'de> serde::Deserialize<'de>,
 {
-    postcard::from_bytes(buf).map_err(|e| format!("{e}").into())
+    Ok(postcard::from_bytes(buf)?)
 }
 
 fn json_to_vec<T>(item: T) -> Result<Vec<u8>, Error>
 where
     T: Serialize,
 {
-    serde_json::to_vec(&item).map_err(Error::from_string)
+    Ok(serde_json::to_vec(&item)?)
 }
 
 pub fn json_from_slice<T>(buf: &[u8]) -> Result<T, Error>
 where
     T: for<'de> serde::Deserialize<'de>,
 {
-    serde_json::from_slice(buf).map_err(Error::from_string)
+    Ok(serde_json::from_slice(buf)?)
 }
 
 pub fn encode_to_vec<T>(item: T) -> Result<Vec<u8>, Error>
@@ -187,7 +215,7 @@ where
 {
     let enc = encode_erased_to_vec(item)?;
     if enc.len() > u32::MAX as usize {
-        return Err(Error::with_msg(format!("too long payload {}", enc.len())));
+        return Err(Error::TooLongPayload(enc.len()));
     }
     let mut h = crc32fast::Hasher::new();
     h.update(&enc);
@@ -323,15 +351,10 @@ where
     T: FrameDecodable,
 {
     if frame.encid() != INMEM_FRAME_ENCID {
-        return Err(Error::with_msg(format!("unknown encoder id {:?}", frame)));
+        return Err(Error::UnknownEncoder(frame.encid()));
     }
     if frame.len() as usize != frame.buf().len() {
-        return Err(Error::with_msg(format!(
-            "buf mismatch  {}  vs  {}  in {:?}",
-            frame.len(),
-            frame.buf().len(),
-            frame
-        )));
+        return Err(Error::BufferMismatch(frame.len(), frame.buf().len(), frame.tyid()));
     }
     if frame.tyid() == ERROR_FRAME_TYPE_ID {
         // error frames are always encoded as json
@@ -376,12 +399,7 @@ where
     } else {
         let tyid = T::FRAME_TYPE_ID;
         if frame.tyid() != tyid {
-            Err(Error::with_msg(format!(
-                "type id mismatch  expect {:04x}  found {:04x}  {:?}",
-                tyid,
-                frame.tyid(),
-                frame
-            )))
+            Err(Error::TyIdMismatch(tyid, frame.tyid()))
         } else {
             match decode_from_slice(frame.buf()) {
                 Ok(item) => Ok(item),
diff --git a/crates/nodenet/src/client.rs b/crates/nodenet/src/client.rs
index 450e718..cd72e0c 100644
--- a/crates/nodenet/src/client.rs
+++ b/crates/nodenet/src/client.rs
@@ -1,5 +1,6 @@
 use err::Error;
 use futures_util::Future;
+use futures_util::TryFutureExt;
 use http::header;
 use http::Method;
 use http::Request;
@@ -8,6 +9,7 @@ use httpclient::http;
 use httpclient::hyper::StatusCode;
 use httpclient::hyper::Uri;
 use items_0::streamitem::sitem_data;
+use items_0::streamitem::sitem_err2_from_string;
 use items_2::framable::Framable;
 use netpod::log::*;
 use netpod::Cluster;
@@ -24,11 +26,11 @@ async fn open_bytes_data_streams_http(
     ctx: ReqCtx,
     cluster: Cluster,
 ) -> Result<Vec<BoxedBytesStream>, Error> {
-    let frame1 = make_node_command_frame(subq.clone())?;
+    let frame1 = make_node_command_frame(subq.clone()).map_err(|e| Error::from_string(e))?;
     let mut streams = Vec::new();
     for node in &cluster.nodes {
         let item = sitem_data(frame1.clone());
-        let buf = item.make_frame_dyn()?;
+        let buf = item.make_frame_dyn().map_err(|e| Error::from_string(e))?;
 
         let url = node.baseurl().join("/api/4/private/eventdata/frames").unwrap();
         debug!("open_event_data_streams_http  post  {url}");
@@ -84,8 +86,9 @@ impl OpenBoxedBytesStreams for OpenBoxedBytesViaHttp {
         &self,
         subq: EventsSubQuery,
         ctx: ReqCtx,
-    ) -> Pin<Box<dyn Future<Output = Result<Vec<BoxedBytesStream>, Error>> + Send>> {
+    ) -> Pin<Box<dyn Future<Output = Result<Vec<BoxedBytesStream>, streams::tcprawclient::Error>> + Send>> {
         let fut = open_bytes_data_streams_http(subq, ctx, self.cluster.clone());
+        let fut = fut.map_err(|e| streams::tcprawclient::Error::from(e.to_string()));
         Box::pin(fut)
     }
 }
diff --git a/crates/nodenet/src/conn.rs b/crates/nodenet/src/conn.rs
index 25821e2..93af134 100644
--- a/crates/nodenet/src/conn.rs
+++ b/crates/nodenet/src/conn.rs
@@ -4,7 +4,9 @@ use err::thiserror;
 use err::ThisError;
 use futures_util::Stream;
 use futures_util::StreamExt;
+use futures_util::TryStreamExt;
 use items_0::on_sitemty_data;
+use items_0::streamitem::sitem_err2_from_string;
 use items_0::streamitem::LogItem;
 use items_0::streamitem::RangeCompletableItem;
 use items_0::streamitem::Sitemty;
@@ -49,6 +51,11 @@ pub enum Error {
     Items(#[from] items_2::Error),
     NotAvailable,
     DebugTest,
+    Generator(#[from] streams::generators::Error),
+    Transform(#[from] streams::transform::Error),
+    Framable(#[from] items_2::framable::Error),
+    Frame(#[from] items_2::frame::Error),
+    InMem(#[from] streams::frames::inmem::Error),
 }
 
 pub async fn events_service(ncc: NodeConfigCached) -> Result<(), Error> {
@@ -138,8 +145,7 @@ pub async fn create_response_bytes_stream(
         // TODO support event blobs as transform
         let fetch_info = evq.ch_conf().to_sf_databuffer()?;
         let stream = disk::raw::conn::make_event_blobs_pipe(&evq, &fetch_info, reqctx, ncc)?;
-        // let stream = stream.map(|x| Box::new(x) as _);
-        let stream = stream.map(|x| x.make_frame_dyn().map(|x| x.freeze()));
+        let stream = stream.map(|x| x.make_frame_dyn().map(|x| x.freeze()).map_err(sitem_err2_from_string));
         let ret = Box::pin(stream);
         Ok(ret)
     } else {
@@ -161,7 +167,11 @@ pub async fn create_response_bytes_stream(
             })
         });
         // let stream = stream.map(move |x| Box::new(x) as Box<dyn Framable + Send>);
-        let stream = stream.map(|x| x.make_frame_dyn().map(bytes::BytesMut::freeze));
+        let stream = stream.map(|x| {
+            x.make_frame_dyn()
+                .map(bytes::BytesMut::freeze)
+                .map_err(sitem_err2_from_string)
+        });
         let ret = Box::pin(stream);
         Ok(ret)
     }
@@ -324,13 +334,13 @@ async fn events_conn_handler_inner<INP>(
     ncc: &NodeConfigCached,
 ) -> Result<(), Error>
 where
-    INP: Stream<Item = Result<Bytes, err::Error>> + Unpin,
+    INP: Stream<Item = Result<Bytes, items_0::streamitem::SitemErrTy>> + Unpin,
 {
     match events_conn_handler_inner_try(netin, netout, addr, scyqueue, ncc).await {
         Ok(_) => (),
         Err(ce) => {
             let mut out = ce.netout;
-            let item: Sitemty<ChannelEvents> = Err(err::Error::from_string(ce.err));
+            let item: Sitemty<ChannelEvents> = Err(items_0::streamitem::SitemErrTy::from_string(ce.err));
             let buf = Framable::make_frame_dyn(&item)?;
             out.write_all(&buf).await?;
         }
@@ -345,7 +355,9 @@ async fn events_conn_handler(
     ncc: NodeConfigCached,
 ) -> Result<(), Error> {
     let (netin, netout) = stream.into_split();
-    let inp = Box::new(TcpReadAsBytes::new(netin));
+    let inp = TcpReadAsBytes::new(netin);
+    let inp = inp.map_err(sitem_err2_from_string);
+    let inp = Box::new(inp);
     let span1 = span!(Level::INFO, "events_conn_handler");
     let r = events_conn_handler_inner(inp, netout, addr, scyqueue, &ncc)
         .instrument(span1)
diff --git a/crates/streams/src/cbor_stream.rs b/crates/streams/src/cbor_stream.rs
index f6ec503..678e942 100644
--- a/crates/streams/src/cbor_stream.rs
+++ b/crates/streams/src/cbor_stream.rs
@@ -18,7 +18,6 @@ use netpod::log::Level;
 use netpod::log::*;
 use netpod::ScalarType;
 use netpod::Shape;
-use std::fmt;
 use std::io::Cursor;
 use std::pin::Pin;
 use std::task::Context;
diff --git a/crates/streams/src/frames/eventsfromframes.rs b/crates/streams/src/frames/eventsfromframes.rs
index 0f48d1c..d87e189 100644
--- a/crates/streams/src/frames/eventsfromframes.rs
+++ b/crates/streams/src/frames/eventsfromframes.rs
@@ -3,6 +3,7 @@ use futures_util::StreamExt;
 use items_0::framable::FrameTypeInnerStatic;
 use items_0::streamitem::sitem_err_from_string;
 use items_0::streamitem::RangeCompletableItem;
+use items_0::streamitem::SitemErrTy;
 use items_0::streamitem::Sitemty;
 use items_0::streamitem::StreamItem;
 use items_2::frame::decode_frame;
@@ -19,7 +20,7 @@ use std::task::Poll;
 pub enum Error {}
 
 pub struct EventsFromFrames<O> {
-    inp: Pin<Box<dyn Stream<Item = Result<StreamItem<InMemoryFrame>, Error>> + Send>>,
+    inp: Pin<Box<dyn Stream<Item = Result<StreamItem<InMemoryFrame>, SitemErrTy>> + Send>>,
     dbgdesc: String,
     errored: bool,
     completed: bool,
@@ -28,7 +29,7 @@ pub struct EventsFromFrames<O> {
 
 impl<O> EventsFromFrames<O> {
     pub fn new(
-        inp: Pin<Box<dyn Stream<Item = Result<StreamItem<InMemoryFrame>, Error>> + Send>>,
+        inp: Pin<Box<dyn Stream<Item = Result<StreamItem<InMemoryFrame>, SitemErrTy>> + Send>>,
         dbgdesc: String,
     ) -> Self {
         Self {
@@ -98,7 +99,7 @@ where
                                     e
                                 );
                                 self.errored = true;
-                                Ready(Some(Err(e)))
+                                Ready(Some(sitem_err_from_string(e)))
                             }
                         },
                     },
diff --git a/crates/streams/src/generators.rs b/crates/streams/src/generators.rs
index c2a2405..dcdc5ff 100644
--- a/crates/streams/src/generators.rs
+++ b/crates/streams/src/generators.rs
@@ -10,7 +10,6 @@ use items_0::on_sitemty_data;
 use items_0::streamitem::sitem_data;
 use items_0::streamitem::sitem_err2_from_string;
 use items_0::streamitem::RangeCompletableItem;
-use items_0::streamitem::SitemErrTy;
 use items_0::streamitem::Sitemty;
 use items_0::streamitem::StreamItem;
 use items_0::Appendable;
@@ -37,6 +36,8 @@ use std::time::Duration;
 pub enum Error {
     UnsupportedIsEventBlobs,
     Transform(#[from] crate::transform::Error),
+    Items2(#[from] items_2::Error),
+    BadChannelName,
 }
 
 pub fn make_test_channel_events_bytes_stream(
@@ -68,7 +69,7 @@ pub fn make_test_channel_events_bytes_stream(
         });
         let stream = stream
             .map_err(sitem_err2_from_string)
-            .map(|x| x.make_frame_dyn().map(|x| x.freeze()));
+            .map(|x| x.make_frame_dyn().map(|x| x.freeze()).map_err(sitem_err2_from_string));
         let ret = Box::pin(stream);
         Ok(ret)
     }
@@ -106,14 +107,10 @@ fn make_test_channel_events_stream_data_inner(
     } else {
         let na: Vec<_> = chn.split("-").collect();
         if na.len() != 3 {
-            Err(Error::with_msg_no_trace(format!(
-                "make_channel_events_stream_data can not understand test channel name: {chn:?}"
-            )))
+            Err(Error::BadChannelName)
         } else {
             if na[0] != "inmem" {
-                Err(Error::with_msg_no_trace(format!(
-                    "make_channel_events_stream_data can not understand test channel name: {chn:?}"
-                )))
+                Err(Error::BadChannelName)
             } else {
                 let _range = subq.range().clone();
                 if na[1] == "d0" {
@@ -124,14 +121,10 @@ fn make_test_channel_events_stream_data_inner(
                         //generator::generate_f32(node_ix, node_count, range)
                         panic!()
                     } else {
-                        Err(Error::with_msg_no_trace(format!(
-                            "make_channel_events_stream_data can not understand test channel name: {chn:?}"
-                        )))
+                        Err(Error::BadChannelName)
                     }
                 } else {
-                    Err(Error::with_msg_no_trace(format!(
-                        "make_channel_events_stream_data can not understand test channel name: {chn:?}"
-                    )))
+                    Err(Error::BadChannelName)
                 }
             }
         }
diff --git a/crates/streams/src/itemclone.rs b/crates/streams/src/itemclone.rs
index c95d762..db5ceff 100644
--- a/crates/streams/src/itemclone.rs
+++ b/crates/streams/src/itemclone.rs
@@ -65,7 +65,7 @@ where
         pin_mut!(fut);
         match fut.poll(cx) {
             Ready(Ok(())) => Ready(Ok(())),
-            Ready(Err(e)) => Ready(Err(e.into())),
+            Ready(Err(_)) => todo!("can not send copy"),
             Pending => Pending,
         }
     }
diff --git a/crates/streams/src/json_stream.rs b/crates/streams/src/json_stream.rs
index 3e80955..c2dc3e1 100644
--- a/crates/streams/src/json_stream.rs
+++ b/crates/streams/src/json_stream.rs
@@ -2,6 +2,7 @@ use crate::cbor_stream::SitemtyDynEventsStream;
 use futures_util::Stream;
 use futures_util::StreamExt;
 use items_0::streamitem::RangeCompletableItem;
+use items_0::streamitem::Sitemty;
 use items_0::streamitem::StreamItem;
 use items_0::Events;
 use items_0::WithLen;
@@ -11,7 +12,23 @@ use std::time::Duration;
 
 #[derive(Debug, thiserror::Error)]
 #[cstm(name = "JsonStream")]
-pub enum Error {}
+pub enum Error {
+    Json(#[from] serde_json::Error),
+    Msg(String),
+}
+
+pub struct ErrMsg<E>(pub E)
+where
+    E: ToString;
+
+impl<E> From<ErrMsg<E>> for Error
+where
+    E: ToString,
+{
+    fn from(value: ErrMsg<E>) -> Self {
+        Self::Msg(value.0.to_string())
+    }
+}
 
 pub struct JsonBytes(String);
 
@@ -56,7 +73,7 @@ pub fn events_stream_to_json_stream(stream: SitemtyDynEventsStream) -> impl Stre
     prepend.chain(stream)
 }
 
-fn map_events(x: Result<StreamItem<RangeCompletableItem<Box<dyn Events>>>, Error>) -> Result<JsonBytes, Error> {
+fn map_events(x: Sitemty<Box<dyn Events>>) -> Result<JsonBytes, Error> {
     match x {
         Ok(x) => match x {
             StreamItem::DataItem(x) => match x {
@@ -104,12 +121,12 @@ fn map_events(x: Result<StreamItem<RangeCompletableItem<Box<dyn Events>>>, Error
                 }
             },
             StreamItem::Log(item) => {
-                info!("{item:?}");
+                debug!("{item:?}");
                 let item = JsonBytes::new(String::new());
                 Ok(item)
             }
             StreamItem::Stats(item) => {
-                info!("{item:?}");
+                debug!("{item:?}");
                 let item = JsonBytes::new(String::new());
                 Ok(item)
             }
diff --git a/crates/streams/src/needminbuffer.rs b/crates/streams/src/needminbuffer.rs
index adac34e..37689b6 100644
--- a/crates/streams/src/needminbuffer.rs
+++ b/crates/streams/src/needminbuffer.rs
@@ -12,7 +12,7 @@ use std::task::Poll;
 pub enum Error {}
 
 pub struct NeedMinBuffer {
-    inp: Pin<Box<dyn Stream<Item = Result<FileChunkRead, Error>> + Send>>,
+    inp: Pin<Box<dyn Stream<Item = Result<FileChunkRead, items_0::streamitem::SitemErrTy>> + Send>>,
     need_min: u32,
     left: Option<FileChunkRead>,
     buf_len_histo: HistoLog2,
@@ -21,9 +21,11 @@ pub struct NeedMinBuffer {
 }
 
 impl NeedMinBuffer {
-    pub fn new(inp: Pin<Box<dyn Stream<Item = Result<FileChunkRead, Error>> + Send>>) -> Self {
+    pub fn new(
+        inp: Pin<Box<dyn Stream<Item = Result<FileChunkRead, items_0::streamitem::SitemErrTy>> + Send>>,
+    ) -> Self {
         Self {
-            inp: inp,
+            inp,
             need_min: 1,
             left: None,
             buf_len_histo: HistoLog2::new(8),
@@ -50,7 +52,7 @@ impl Drop for NeedMinBuffer {
 }
 
 impl Stream for NeedMinBuffer {
-    type Item = Result<FileChunkRead, Error>;
+    type Item = Result<FileChunkRead, items_0::streamitem::SitemErrTy>;
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
         use Poll::*;
diff --git a/crates/streams/src/plaineventsjson.rs b/crates/streams/src/plaineventsjson.rs
index 3427278..8a986de 100644
--- a/crates/streams/src/plaineventsjson.rs
+++ b/crates/streams/src/plaineventsjson.rs
@@ -24,6 +24,7 @@ use std::time::Instant;
 pub enum Error {
     Stream(#[from] crate::plaineventsstream::Error),
     Json(#[from] serde_json::Error),
+    Collect(#[from] crate::collect::Error),
 }
 
 pub async fn plain_events_json(
diff --git a/crates/streams/src/plaineventsstream.rs b/crates/streams/src/plaineventsstream.rs
index 40d6cbd..c4e3a04 100644
--- a/crates/streams/src/plaineventsstream.rs
+++ b/crates/streams/src/plaineventsstream.rs
@@ -20,6 +20,7 @@ use std::pin::Pin;
 pub enum Error {
     Netpod(#[from] netpod::NetpodError),
     Transform(#[from] crate::transform::Error),
+    TcpRawClient(#[from] crate::tcprawclient::Error),
 }
 
 pub type DynEventsStream = Pin<Box<dyn Stream<Item = Sitemty<Box<dyn Events>>> + Send>>;
@@ -77,7 +78,7 @@ pub async fn dyn_events_stream(
     });
 
     if let Some(wasmname) = evq.test_do_wasm() {
-        let stream = transform_wasm(stream, wasmname, ctx).await?;
+        let stream = transform_wasm::<_, items_0::streamitem::SitemErrTy>(stream, wasmname, ctx).await?;
         Ok(Box::pin(stream))
     } else {
         Ok(Box::pin(stream))
diff --git a/crates/streams/src/rangefilter2.rs b/crates/streams/src/rangefilter2.rs
index 50f16cd..a8325ec 100644
--- a/crates/streams/src/rangefilter2.rs
+++ b/crates/streams/src/rangefilter2.rs
@@ -1,6 +1,6 @@
-use err::Error;
 use futures_util::Stream;
 use futures_util::StreamExt;
+use items_0::streamitem::sitem_err_from_string;
 use items_0::streamitem::RangeCompletableItem;
 use items_0::streamitem::Sitemty;
 use items_0::streamitem::StatsItem;
@@ -22,13 +22,12 @@ use items_0::Events;
 #[cfg(test)]
 use std::collections::VecDeque;
 
-#[allow(unused)]
-macro_rules! trace_emit {
-    ($det:expr, $($arg:tt)*) => {
-        if $det {
-            eprintln!($($arg)*);
-        }
-    };
+macro_rules! trace_emit { ($det:expr, $($arg:tt)*) => ( if false && $det { trace!($($arg)*); } ) }
+
+#[derive(Debug, thiserror::Error)]
+#[cstm(name = "Rangefilter")]
+pub enum Error {
+    Merge(#[from] MergeError),
 }
 
 pub struct RangeFilter2<S, ITY>
@@ -146,8 +145,7 @@ where
                     } else {
                         trace_emit!(self.trdet, "discarding events  len {:?}", lige - 1);
                         let mut dummy = item.new_empty();
-                        item.drain_into(&mut dummy, (0, lige - 1))
-                            .map_err(|e| format!("{e} unexpected MergeError while remove of items"))?;
+                        item.drain_into(&mut dummy, (0, lige - 1))?;
                         self.slot1 = None;
                         item
                     }
@@ -157,8 +155,7 @@ where
                     trace_emit!(self.trdet, "drain into to keep one before");
                     let n = item.len();
                     let mut keep = item.new_empty();
-                    item.drain_into(&mut keep, (n.max(1) - 1, n))
-                        .map_err(|e| format!("{e} unexpected MergeError while remove of items"))?;
+                    item.drain_into(&mut keep, (n.max(1) - 1, n))?;
                     self.slot1 = Some(keep);
                     item.new_empty()
                 }
@@ -192,10 +189,7 @@ where
         loop {
             break if self.complete {
                 error!("{} poll_next on complete", Self::type_name());
-                Ready(Some(Err(Error::with_msg_no_trace(format!(
-                    "{} poll_next on complete",
-                    Self::type_name()
-                )))))
+                Ready(Some(sitem_err_from_string("poll next on complete")))
             } else if self.done {
                 self.complete = true;
                 Ready(None)
@@ -223,7 +217,7 @@ where
                             Err(e) => {
                                 error!("sees: {e}");
                                 self.inp_done = true;
-                                Ready(Some(Err(e)))
+                                Ready(Some(sitem_err_from_string(e)))
                             }
                         },
                         Ok(StreamItem::DataItem(RangeCompletableItem::RangeComplete)) => {
diff --git a/crates/streams/src/tcprawclient.rs b/crates/streams/src/tcprawclient.rs
index b365c50..a0396b2 100644
--- a/crates/streams/src/tcprawclient.rs
+++ b/crates/streams/src/tcprawclient.rs
@@ -7,14 +7,15 @@ use crate::frames::eventsfromframes::EventsFromFrames;
 use crate::frames::inmem::BoxedBytesStream;
 use crate::frames::inmem::InMemoryFrameStream;
 use crate::frames::inmem::TcpReadAsBytes;
-use err::Error;
 use futures_util::Future;
 use futures_util::Stream;
+use futures_util::TryStreamExt;
 use http::Uri;
 use httpclient::body_bytes;
 use httpclient::http;
 use items_0::framable::FrameTypeInnerStatic;
 use items_0::streamitem::sitem_data;
+use items_0::streamitem::sitem_err2_from_string;
 use items_0::streamitem::Sitemty;
 use items_2::eventfull::EventFull;
 use items_2::framable::EventQueryJsonStringFrame;
@@ -42,6 +43,40 @@ use tokio::net::TcpStream;
 
 pub const TEST_BACKEND: &str = "testbackend-00";
 
+#[derive(Debug, thiserror::Error)]
+#[cstm(name = "TcpRawClient")]
+pub enum Error {
+    IO(#[from] std::io::Error),
+    Msg(String),
+    Frame(#[from] items_2::frame::Error),
+    Framable(#[from] items_2::framable::Error),
+    Json(#[from] serde_json::Error),
+    Http(#[from] http::Error),
+    HttpClient(#[from] httpclient::Error),
+    Hyper(#[from] httpclient::hyper::Error),
+    #[error("ServerError({0:?}, {1})")]
+    ServerError(http::response::Parts, String),
+}
+
+struct ErrMsg<E>(E)
+where
+    E: ToString;
+
+impl<E> From<ErrMsg<E>> for Error
+where
+    E: ToString,
+{
+    fn from(value: ErrMsg<E>) -> Self {
+        Self::Msg(value.0.to_string())
+    }
+}
+
+impl From<String> for Error {
+    fn from(value: String) -> Self {
+        Self::Msg(value)
+    }
+}
+
 pub trait OpenBoxedBytesStreams {
     fn open(
         &self,
@@ -75,8 +110,10 @@ pub async fn x_processed_event_blobs_stream_from_node_tcp(
     netout.write_all(&buf).await?;
     netout.flush().await?;
     netout.forget();
-    let inp = Box::pin(TcpReadAsBytes::new(netin)) as BoxedBytesStream;
+    let inp = TcpReadAsBytes::new(netin).map_err(sitem_err2_from_string);
+    let inp = Box::pin(inp) as BoxedBytesStream;
     let frames = InMemoryFrameStream::new(inp, subq.inmem_bufcap());
+    let frames = frames.map_err(sitem_err2_from_string);
     let frames = Box::pin(frames);
     let items = EventsFromFrames::new(frames, addr);
     Ok(Box::pin(items))
@@ -106,31 +143,20 @@ pub async fn x_processed_event_blobs_stream_from_node_http(
         .header(header::HOST, uri.host().unwrap())
         .header(header::ACCEPT, APP_OCTET)
         .header(ctx.header_name(), ctx.header_value())
-        .body(body_bytes(buf))
-        .map_err(|e| Error::with_msg_no_trace(e.to_string()))?;
+        .body(body_bytes(buf))?;
     let mut client = httpclient::connect_client(req.uri()).await?;
-    let res = client
-        .send_request(req)
-        .await
-        .map_err(|e| Error::with_msg_no_trace(e.to_string()))?;
+    let res = client.send_request(req).await?;
     if res.status() != StatusCode::OK {
         error!("Server error  {:?}", res);
         let (head, body) = res.into_parts();
         let buf = httpclient::read_body_bytes(body).await?;
         let s = String::from_utf8_lossy(&buf);
-        return Err(Error::with_msg(format!(
-            concat!(
-                "Server error  {:?}\n",
-                "---------------------- message from http body:\n",
-                "{}\n",
-                "---------------------- end of http body",
-            ),
-            head, s
-        )));
+        return Err(Error::ServerError(head, s.to_string()));
     }
     let (_head, body) = res.into_parts();
     let inp = Box::pin(httpclient::IncomingStream::new(body)) as BoxedBytesStream;
     let frames = InMemoryFrameStream::new(inp, subq.inmem_bufcap());
+    let frames = frames.map_err(sitem_err2_from_string);
     let frames = Box::pin(frames);
     let stream = EventsFromFrames::new(frames, url.to_string());
     debug!("open_event_data_streams_http  done  {url}");
@@ -175,8 +201,11 @@ where
         netout.flush().await?;
         netout.forget();
         // TODO for images, we need larger buffer capacity
-        let inp = Box::pin(TcpReadAsBytes::new(netin)) as BoxedBytesStream;
+        let inp = TcpReadAsBytes::new(netin);
+        let inp = inp.map_err(sitem_err2_from_string);
+        let inp = Box::pin(inp) as BoxedBytesStream;
         let frames = InMemoryFrameStream::new(inp, subq.inmem_bufcap());
+        let frames = frames.map_err(sitem_err2_from_string);
         let frames = Box::pin(frames);
         let stream = EventsFromFrames::<T>::new(frames, addr);
         streams.push(Box::pin(stream) as _);
@@ -193,6 +222,7 @@ where
     T: FrameTypeInnerStatic + DeserializeOwned + Send + Unpin + fmt::Debug + 'static,
 {
     let frames = InMemoryFrameStream::new(inp, bufcap);
+    let frames = frames.map_err(sitem_err2_from_string);
     // TODO let EventsFromFrames accept also non-boxed input?
     let frames = Box::pin(frames);
     let stream = EventsFromFrames::<T>::new(frames, dbgdesc);
diff --git a/crates/streams/src/test.rs b/crates/streams/src/test.rs
index 38283e1..c7244f9 100644
--- a/crates/streams/src/test.rs
+++ b/crates/streams/src/test.rs
@@ -5,7 +5,6 @@ mod events;
 #[cfg(test)]
 mod timebin;
 
-use err::Error;
 use futures_util::stream;
 use futures_util::Stream;
 use items_0::streamitem::sitem_data;
@@ -17,6 +16,10 @@ use items_2::eventsdim0::EventsDim0;
 use netpod::timeunits::SEC;
 use std::pin::Pin;
 
+#[derive(Debug, thiserror::Error)]
+#[cstm(name = "StreamsTest")]
+pub enum Error {}
+
 type BoxedEventStream = Pin<Box<dyn Stream<Item = Sitemty<ChannelEvents>> + Send>>;
 
 // TODO use some xorshift generator.
@@ -51,11 +54,10 @@ fn merge_mergeable_00() -> Result<(), Error> {
     runfut(fut)
 }
 
-fn runfut<T, F>(fut: F) -> Result<T, err::Error>
+fn runfut<F, T, E>(fut: F) -> Result<T, E>
 where
-    F: std::future::Future<Output = Result<T, Error>>,
+    F: std::future::Future<Output = Result<T, E>>,
+    E: std::error::Error,
 {
-    use futures_util::TryFutureExt;
-    let fut = fut.map_err(|e| e.into());
     taskrun::run(fut)
 }
diff --git a/crates/streams/src/test/events.rs b/crates/streams/src/test/events.rs
index 5e2a422..c3d1948 100644
--- a/crates/streams/src/test/events.rs
+++ b/crates/streams/src/test/events.rs
@@ -8,6 +8,7 @@ use crate::tcprawclient::TEST_BACKEND;
 use futures_util::future;
 use futures_util::Future;
 use futures_util::StreamExt;
+use futures_util::TryFutureExt;
 use netpod::log::*;
 use netpod::range::evrange::NanoRange;
 use netpod::range::evrange::SeriesRange;
@@ -83,8 +84,8 @@ impl OpenBoxedBytesStreams for StreamOpener {
         &self,
         subq: EventsSubQuery,
         _ctx: ReqCtx,
-    ) -> Pin<Box<dyn Future<Output = Result<Vec<BoxedBytesStream>, Error>> + Send>> {
-        Box::pin(stream_opener(subq))
+    ) -> Pin<Box<dyn Future<Output = Result<Vec<BoxedBytesStream>, crate::tcprawclient::Error>> + Send>> {
+        Box::pin(stream_opener(subq).map_err(|e| crate::tcprawclient::Error::Msg(format!("{e}"))))
     }
 }
 
diff --git a/crates/streams/src/teststream.rs b/crates/streams/src/teststream.rs
index d1c85f6..3460a9c 100644
--- a/crates/streams/src/teststream.rs
+++ b/crates/streams/src/teststream.rs
@@ -1,21 +1,20 @@
 use crate::timebin::cached::reader::EventsReadProvider;
 use crate::timebin::cached::reader::EventsReading;
 use futures_util::Stream;
+use items_0::streamitem::sitem_err2_from_string;
 use items_0::streamitem::Sitemty;
 use items_2::channelevents::ChannelEvents;
 use netpod::range::evrange::SeriesRange;
 use query::api4::events::EventsSubQuery;
-use rand_xoshiro::rand_core::SeedableRng;
-use rand_xoshiro::Xoshiro128PlusPlus;
 use std::pin::Pin;
 
 fn make_stream(chname: &str, range: &SeriesRange) -> Pin<Box<dyn Stream<Item = Sitemty<ChannelEvents>> + Send>> {
     if chname == "unittest;scylla;cont;scalar;f32" {
-        let e = ::err::Error::with_msg_no_trace("unknown channel {chname}");
+        let e = sitem_err2_from_string(format!("unknown channel {chname}"));
         let ret = futures_util::stream::iter([Err(e)]);
         Box::pin(ret)
     } else {
-        let e = ::err::Error::with_msg_no_trace("unknown channel {chname}");
+        let e = sitem_err2_from_string(format!("unknown channel {chname}"));
         let ret = futures_util::stream::iter([Err(e)]);
         Box::pin(ret)
     }
diff --git a/crates/streams/src/timebinnedjson.rs b/crates/streams/src/timebinnedjson.rs
index 98ada0e..f066f52 100644
--- a/crates/streams/src/timebinnedjson.rs
+++ b/crates/streams/src/timebinnedjson.rs
@@ -14,6 +14,7 @@ use futures_util::Stream;
 use futures_util::StreamExt;
 use items_0::collect_s::CollectableDyn;
 use items_0::on_sitemty_data;
+use items_0::streamitem::sitem_err2_from_string;
 use items_0::streamitem::RangeCompletableItem;
 use items_0::streamitem::Sitemty;
 use items_0::streamitem::StreamItem;
@@ -41,6 +42,23 @@ pub enum Error {
     Query(#[from] query::api4::binned::Error),
     FromLayers(#[from] super::timebin::fromlayers::Error),
     Transform(#[from] super::transform::Error),
+    TcpRawClient(#[from] crate::tcprawclient::Error),
+    Collect(#[from] crate::collect::Error),
+    Json(#[from] serde_json::Error),
+    Msg(String),
+}
+
+struct ErrMsg<E>(E)
+where
+    E: ToString;
+
+impl<E> From<ErrMsg<E>> for Error
+where
+    E: ToString,
+{
+    fn from(value: ErrMsg<E>) -> Self {
+        Self::Msg(value.0.to_string())
+    }
 }
 
 #[allow(unused)]
@@ -435,7 +453,7 @@ pub async fn timebinned_json_framed(
     // TODO skip the intermediate conversion to js value, go directly to string data
     let stream = stream.map(|x| match x {
         Ok(x) => Ok(JsonBytes::new(serde_json::to_string(&x).unwrap())),
-        Err(e) => Err(e),
+        Err(e) => Err(crate::json_stream::Error::from(crate::json_stream::ErrMsg(e))),
     });
     Ok(Box::pin(stream))
 }
diff --git a/crates/streams/src/transform.rs b/crates/streams/src/transform.rs
index ff86ad7..0d5bf3d 100644
--- a/crates/streams/src/transform.rs
+++ b/crates/streams/src/transform.rs
@@ -20,23 +20,20 @@ use std::pin::Pin;
 
 #[derive(Debug, thiserror::Error)]
 #[cstm(name = "Transform")]
-pub enum Error {}
+pub enum Error {
+    #[error("UnhandledQuery({0:?})")]
+    UnhandledQuery(EventTransformQuery),
+}
 
 pub fn build_event_transform(tr: &TransformQuery) -> Result<TransformEvent, Error> {
     let trev = tr.get_tr_event();
     match trev {
         EventTransformQuery::ValueFull => Ok(make_transform_identity()),
         EventTransformQuery::MinMaxAvgDev => Ok(make_transform_min_max_avg()),
-        EventTransformQuery::ArrayPick(..) => Err(Error::with_msg_no_trace(format!(
-            "build_event_transform don't know what to do {trev:?}"
-        ))),
+        EventTransformQuery::ArrayPick(..) => Err(Error::UnhandledQuery(trev.clone())),
         EventTransformQuery::PulseIdDiff => Ok(make_transform_pulse_id_diff()),
-        EventTransformQuery::EventBlobsVerbatim => Err(Error::with_msg_no_trace(format!(
-            "build_event_transform don't know what to do {trev:?}"
-        ))),
-        EventTransformQuery::EventBlobsUncompressed => Err(Error::with_msg_no_trace(format!(
-            "build_event_transform don't know what to do {trev:?}"
-        ))),
+        EventTransformQuery::EventBlobsVerbatim => Err(Error::UnhandledQuery(trev.clone())),
+        EventTransformQuery::EventBlobsUncompressed => Err(Error::UnhandledQuery(trev.clone())),
     }
 }