diff --git a/Program.fs b/Program.fs
index ba7d1ffac9976d92903c83d4d9f76b18583d41cd..df5cb87d9a601daed27e6d23f438390806b19d24 100644
--- a/Program.fs
+++ b/Program.fs
@@ -179,7 +179,7 @@ let main argv =
     let backupTarget = results.GetResult (Target, defaultValue = Environment.GetEnvironmentVariable "TARGET")
     match backupTarget with
       | null ->
-          logger.Error "TARGET is not defined%s" ""
+          logger.Error "TARGET is not defined"
           ExitBadParam
       | _ ->
           let backupTarget = ToMingwPath backupTarget
@@ -210,9 +210,12 @@ let main argv =
               logger.Info "mbackup exit"
               proc.ExitCode
             else
-              logger.Error "mbackup timed out while waiting for rsync to complete%s" ""
+              logger.Error "mbackup timed out while waiting for rsync to complete"
               ExitTimeout
           with
-            | _ ->
-              logger.Error "Create runtime dir failed%s" ""
+            | :? System.IO.IOException as ex ->
+              logger.Error "IO Error: %s %s" ex.Source ex.Message
+              ExitIOError
+            | ex ->
+              logger.Error "Unexpected Error: %s" ex.Message
               ExitIOError
diff --git a/operational b/operational
index d28b4da809f7faed2deb950f884151447c5bc0f6..eb28c65274b69af32ae3fb95f5992c1990050125 100644
--- a/operational
+++ b/operational
@@ -85,6 +85,9 @@ C:\ProgramData\mbackup\mbackup.ini
 
 * later                                                               :entry:
 ** 2019-11-14 supports expand Downloads dir in user-default.list
+** 2019-11-14 vscode f# doesn't support open a module
+it can only support open a namespace.
+using the vscode Ionide-fsharp extension.
 * current                                                             :entry:
 ** 
 ** 2019-11-14 support mbackup.ini config.