fix fix 2

src/asammdf/gui/widgets/numeric.py

@@ -1626,7 +1626,7 @@ def keyPressEvent(self, event):
             )
 
             if file_name:
-                signals = [signal for signal in self.channels.dataView.signals if signal.enable]
+                signals = [signal for signal in self.channels.dataView.backend.signals if signal.enable]
                 if signals:
                     with mdf_module.MDF() as mdf:
                         groups = {}