error on starting tweaks > appearance > theme

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Distribution: Ubuntu 11.10 oneiric
Application: Ubuntu Tweak 0.6.0+20111020
Desktop:ubuntu

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/main.py", line 436, in load_module
    page = module()
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/tweaks/theme.py", line 68, in __init__
    values=valid_window_themes,
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/factory.py", line 46, in create
    return getattr(cls, 'do_composite_create')(widget, **kwargs)
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/factory.py", line 59, in do_composite_create
    new_widget = globals().get(widget)(**kwargs)
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/gui/widgets.py", line 149, in __init__
    current_value = self._setting.get_value()
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/settings/gconfsettings.py", line 35, in get_value
    gconfvalue = self.client.get(self.key)
  File "/usr/lib/python2.7/dist-packages/gi/types.py", line 43, in function
    return info.invoke(*args, **kwargs)
GError: Der Konfigurationsserver konnte nicht kontaktiert werden: D-BUS-Fehler: Method "LookupExtended" with signature "ssb" on interface "org.gnome.GConf.Database" doesn't exist