shortcuts do not work

[paul]

I can not longer use shortcuts or open the shortcuts dialog in the settings dialog of the r plugin. Instead I receive this error message, when starting from console and trying to open the dialog:

xUbuntu: 15.04
Gedit Version: 3.10.4
Plugin-version: 0.8.0.2-Gtk3-Python3-1ubuntu1

paul@paul-laptop:~$ gedit
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
Traceback (most recent call last):
  File "/usr/lib/gedit/plugins/RCtrl.py", line 4665, in ButtonChangeShortcuts_clicked
    self.ChangeShortcuts_ui = create_UI_from_file_GtkBuilder_or_Glade(self.get_data_dir()+"/ShortcutsDialog.glade",self.get_data_dir()+"/ShortcutsDialog.ui")
  File "/usr/lib/gedit/plugins/RCtrl.py", line 146, in create_UI_from_file_GtkBuilder_or_Glade
    ui.add_from_file(gtkbuilder_file)
GLib.Error: gtk-builder-error-quark: Ungültige Eigenschaft: GtkDialog.has_separator in Zeile 9 (11)