Ubuntu Tweak, Desktop-settings error

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/mainwindow.py", line 401, in setup_notebook
    page = module()
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/modules/loginsettings.py", line 52, in __init__
    key="/apps/gdm/simple-greeter/disable_user_list"),
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/common/factory.py", line 51, in create
    return getattr(cls, 'do_create')(widget, **kwargs)
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/common/factory.py", line 70, in do_create
    return globals().get(widget)(**kwargs)
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/widgets/widgets.py", line 77, in __init__
    self.set_active(self.__setting.get_value(self.__user))
TypeError: an integer is required