diff -r a049926fcdd3 -r 8ffa0c27f434 QTfrontend/net/recorder.h
--- a/QTfrontend/net/recorder.h	Thu Jan 17 22:48:14 2019 +0100
+++ b/QTfrontend/net/recorder.h	Thu Jan 17 23:46:00 2019 +0100
@@ -51,6 +51,7 @@
     signals:
         void onProgress(float progress); // 0 < progress < 1
         void encodingFinished(bool success);
+        void ErrorMessage(const QString &);
 
     private:
         bool finished;