diff --git a/apps/backend/backend_commit.c b/apps/backend/backend_commit.c
index bd5aed49..51a4dbdc 100644
--- a/apps/backend/backend_commit.c
+++ b/apps/backend/backend_commit.c
@@ -221,8 +221,11 @@ startup_common(clicon_handle       h,
     if (msdiff){
         if ((ret = clixon_module_upgrade(h, xt, msdiff, cbret)) < 0)
             goto done;
-        if (ret == 0)
+        if (ret == 0){
+            if (cbuf_len(cbret) == 0)
+                cprintf(cbret, "Module-set upgrade function returned failure but lacks reason (cbret is not set)");
             goto fail;
+        }
     }
     /* Print upgraded db: -q backend switch for debugging/ showing upgraded config only */
     if (clicon_quit_upgrade_get(h) == 1){
diff --git a/lib/src/clixon_yang_module.c b/lib/src/clixon_yang_module.c
index 74af4394..8d4867b9 100644
--- a/lib/src/clixon_yang_module.c
+++ b/lib/src/clixon_yang_module.c
@@ -424,8 +424,10 @@ mod_ns_upgrade(clicon_handle h,
     /* If modified or added get to revision from system */
     if (xml_flag(xmod, (XML_FLAG_CHANGE|XML_FLAG_ADD)) != 0x0){
         yspec = clicon_dbspec_yang(h);
-        if ((ymod = yang_find_module_by_namespace(yspec, ns)) == NULL)
+        if ((ymod = yang_find_module_by_namespace(yspec, ns)) == NULL){
+            cprintf(cbret, "Module-set upgrade header contains namespace %s, but is not found in running system", ns);
             goto fail;
+        }
         if ((yrev = yang_find(ymod, Y_REVISION, NULL)) == NULL){
             retval = 1;
             goto done;
diff --git a/test/lib.sh b/test/lib.sh
index bc4b03ed..634216a7 100755
--- a/test/lib.sh
+++ b/test/lib.sh
@@ -427,7 +427,8 @@ function err(){
   ret=$2
   echo -e "\e[31m\nError in Test$testnr [$testname]:"
   if [ $# -gt 0 ]; then 
-      echo "Expected: $1"
+      echo "Expected"
+      echo "$1"
       echo
   fi
   if [ $# -gt 1 ]; then 
diff --git a/test/test_http_data.sh b/test/test_http_data.sh
index 6a0a7329..a0e50549 100755
--- a/test/test_http_data.sh
+++ b/test/test_http_data.sh
@@ -195,7 +195,6 @@ EOF
     if ! $enable; then
         # XXX or bad request?
         new "WWW get html, not enabled, expect not found"
-#       echo "curl $CURLOPTS -X GET -H 'Accept: text/html' $proto://localhost/data/index.html"
         expectpart "$(curl $CURLOPTS -X GET -H 'Accept: text/html' $proto://localhost/data/index.html)" 0 "HTTP/$HVER 404"
     else
         new "WWW get root expect 404 without body"