diff --git a/src/musredit_qt5/mupp/PmuppGui.cpp b/src/musredit_qt5/mupp/PmuppGui.cpp
index aa8707c89..693399ba7 100644
--- a/src/musredit_qt5/mupp/PmuppGui.cpp
+++ b/src/musredit_qt5/mupp/PmuppGui.cpp
@@ -31,6 +31,7 @@
 #include <sys/ipc.h>
 #include <sys/msg.h>
 #include <sys/stat.h>
+#include <errno.h>
 
 #include <cmath>
 #include <iostream>
@@ -471,7 +472,7 @@ void PmuppGui::aboutToQuit()
     msqid = msgget(key, flags | S_IRUSR | S_IWUSR);
     if (msqid != -1) {
       if (msgctl(msqid, IPC_RMID, NULL) == -1) {
-        std::cerr << "**ERROR** couldn't removed the message queue (msqid=" << msqid << ")." << std::endl << std::endl;
+        std::cerr << "**ERROR** couldn't removed the message queue (msqid=" << msqid << ", " << std::strerror(errno) << ")." << std::endl << std::endl;
       }
     }
   }  
@@ -2376,7 +2377,7 @@ void PmuppGui::plot()
 
   key = ftok(QCoreApplication::applicationFilePath().toLatin1().data(), fMuppInstance);
   if (key == -1) {
-    QMessageBox::critical(this, "ERROR", "Couldn't obtain necessary key to install the IPC message queue.");
+    QMessageBox::critical(this, "ERROR", QString("Couldn't obtain necessary key to install the IPC message queue (%1).").arg(std::strerror(errno)));
     return;
   }
 
@@ -2386,7 +2387,7 @@ void PmuppGui::plot()
   // open the message queue
   msqid = msgget(key, flags | S_IRUSR | S_IWUSR);
   if (msqid == -1) {
-    QMessageBox::critical(this, "ERROR", "Couldn't open the IPC message queue.");
+    QMessageBox::critical(this, "ERROR", QString("Couldn't open the IPC message queue (%1).").arg(std::strerror(errno)));
     return;
   }
 
@@ -2395,7 +2396,7 @@ void PmuppGui::plot()
   msg.mtype = 1;
   strncpy(msg.mtext, pathName.toLatin1().data(), PMUPP_MAX_MTEXT);
   if (msgsnd(msqid, &msg, strlen(msg.mtext)+1, flags) == -1) {
-    QMessageBox::critical(this, "ERROR", "Couldn't send the IPC message.");
+      QMessageBox::critical(this, "ERROR", QString("Couldn't send the IPC message (%1).").arg(std::strerror(errno)));
     return;
   }
 
diff --git a/src/musredit_qt6/mupp/PmuppGui.cpp b/src/musredit_qt6/mupp/PmuppGui.cpp
index c9b74528a..2350395a6 100644
--- a/src/musredit_qt6/mupp/PmuppGui.cpp
+++ b/src/musredit_qt6/mupp/PmuppGui.cpp
@@ -31,6 +31,7 @@
 #include <sys/ipc.h>
 #include <sys/msg.h>
 #include <sys/stat.h>
+#include <errno.h>
 
 #include <cmath>
 #include <iostream>
@@ -470,7 +471,7 @@ void PmuppGui::aboutToQuit()
     msqid = msgget(key, flags | S_IRUSR | S_IWUSR);
     if (msqid != -1) {
       if (msgctl(msqid, IPC_RMID, NULL) == -1) {
-        std::cerr << "**ERROR** couldn't removed the message queue (msqid=" << msqid << ")." << std::endl << std::endl;
+        std::cerr << "**ERROR** couldn't removed the message queue (msqid=" << msqid << ", " << std::strerror(errno) << ")." << std::endl << std::endl;
       }
     }
   }  
@@ -2185,7 +2186,7 @@ void PmuppGui::plot()
 
   key = ftok(QCoreApplication::applicationFilePath().toLatin1().data(), fMuppInstance);
   if (key == -1) {
-    QMessageBox::critical(this, "ERROR", "Couldn't obtain necessary key to install the IPC message queue.");
+    QMessageBox::critical(this, "ERROR", QString("Couldn't obtain necessary key to install the IPC message queue (%1).").arg(std::strerror(errno)));
     return;
   }
 
@@ -2195,7 +2196,7 @@ void PmuppGui::plot()
   // open the message queue
   msqid = msgget(key, flags | S_IRUSR | S_IWUSR);
   if (msqid == -1) {
-    QMessageBox::critical(this, "ERROR", "Couldn't open the IPC message queue.");
+    QMessageBox::critical(this, "ERROR", QString("Couldn't open the IPC message queue (%1).").arg(std::strerror(errno)));
     return;
   }
 
@@ -2204,7 +2205,7 @@ void PmuppGui::plot()
   msg.mtype = 1;
   strncpy(msg.mtext, pathName.toLatin1().data(), PMUPP_MAX_MTEXT);
   if (msgsnd(msqid, &msg, strlen(msg.mtext)+1, flags) == -1) {
-    QMessageBox::critical(this, "ERROR", "Couldn't send the IPC message.");
+    QMessageBox::critical(this, "ERROR", QString("Couldn't send the IPC message (%1).").arg(std::strerror(errno)));
     return;
   }