display logged error messages within program

src/gui_qt/main/mainwindow.py

@@ -1019,3 +1019,10 @@ class NMRMainWindow(QtWidgets.QMainWindow, Ui_BaseWindow):
     def look_for_update(self):
         w = UpdateDialog(parent=self)
         w.show()
+
+    @QtCore.pyqtSlot(name='on_actionShow_error_log_triggered')
+    def open_log(self):
+        from ..lib.logger import QLog
+
+        QLog(parent=self).show()
+