Greenscreen bei Aufruf der A/V Einstellungen

Screen <class 'Plugins.SystemPlugins.Videomode.plugin.VideoSetup'>((<Plugins.SystemPlugins.Videomode.VideoHardware.VideoHardware instance at 0x1ce0990>,), {}): <type 'exceptions.KeyError'>
Traceback (most recent call last):
  File "/usr/lib/enigma2/python/mytest.py", line 340, in create
    return screen(self, *arguments, **kwargs)
  File "/usr/lib/enigma2/python/Plugins/SystemPlugins/Videomode/plugin.py", line 39, in __init__
    self.createSetup()
  File "/usr/lib/enigma2/python/Plugins/SystemPlugins/Videomode/plugin.py", line 101, in createSetup
    if SystemInfo["SupportsAC3Plus"]:
KeyError: 'SupportsAC3Plus'
Traceback (most recent call last):
  File "/usr/lib/enigma2/python/Components/ActionMap.py", line 66, in action
    return ActionMap.action(self, contexts, action)
  File "/usr/lib/enigma2/python/Components/ActionMap.py", line 46, in action
    res = self.actions[action]()
  File "/usr/lib/enigma2/python/Screens/Menu.py", line 92, in okbuttonClick
    selection[1]()
  File "/usr/lib/enigma2/python/Screens/Menu.py", line 47, in __call__
    self.fnc(*self.args)
  File "/usr/lib/enigma2/python/Plugins/SystemPlugins/Videomode/plugin.py", line 226, in videoSetupMain
    session.open(VideoSetup, video_hw)
  File "/usr/lib/enigma2/python/mytest.py", line 419, in open
    dlg.isTmp = True
AttributeError: 'NoneType' object has no attribute 'isTmp'
(PyObject_CallObject(<bound method NumberActionMap.action of <Components.ActionMap.NumberActionMap instance at 0x29dcbc0>>,('OkCancelActions', 'ok')) failed)
]]>
        </enigma2crashlog>