diff --git a/src/musrview.cpp b/src/musrview.cpp
index 69385194..eddb1eab 100644
--- a/src/musrview.cpp
+++ b/src/musrview.cpp
@@ -297,7 +297,10 @@ int main(int argc, char *argv[])
 
   success = dataHandler->IsAllDataAvailable();
   if (!success) {
-    std::cerr << std::endl << ">> musrview **ERROR** Couldn't read all data files, will quit ..." << std::endl;
+    errMsg << ">> musrview **ERROR** Couldn't read all data files, will quit ...\n";
+    std::cerr << errMsg.str();
+    if (show_errMsgBox)
+      musrview_error_msg(errMsg.str());
     result = PMUSR_DATA_FILE_READ_ERROR;
   }
 
@@ -318,8 +321,11 @@ int main(int argc, char *argv[])
       if (runPresent) {
         success = runListCollection->Add(i, kView);
         if (!success) {
-          std::cerr << std::endl << ">> musrview **ERROR** Couldn't handle run no " << i << " ";
-          std::cerr << (*msrHandler->GetMsrRunList())[i].GetRunName()->Data();
+          errMsg << ">> musrview **ERROR** Couldn't handle run no " << i << " ";
+          errMsg << (*msrHandler->GetMsrRunList())[i].GetRunName()->Data() << "\n";
+          std::cerr << errMsg.str();
+          if (show_errMsgBox)
+            musrview_error_msg(errMsg.str());
           result = PMUSR_MSR_RUN_ERROR;
           break;
         }
@@ -359,8 +365,10 @@ int main(int argc, char *argv[])
                                      fourier, avg, theoAtData);
 
       if (!musrCanvas->IsValid()) {
-        std::cerr << std::endl << ">> musrview **SEVERE ERROR** Couldn't invoke all necessary objects, will quit.";
-        std::cerr << std::endl;
+        errMsg << ">> musrview **SEVERE ERROR** Couldn't invoke all necessary objects, will quit.\n";
+        std::cerr << errMsg.str();
+        if (show_errMsgBox)
+          musrview_error_msg(errMsg.str());
         ok = false;
         break;
       }