Traceback (most recent call last):
  File "/usr/bin/jockey-gtk", line 344, in on_button_toggle_clicked
    'toggle', False):
  File "/usr/lib/python2.5/site-packages/jockey/ui.py", line 571, in set_handler_enable
    handler_id, enable)
  File "/usr/lib/python2.5/site-packages/jockey/backend.py", line 116, in polkit_auth_wrapper
    return fn(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/jockey/backend.py", line 87, in dbus_sync_call_signal_wrapper
    raise _h_exception_exc
DBusException: org.freedesktop.DBus.Python.AttributeError: Traceback (most recent call last):
  File "/var/lib/python-support/python2.5/dbus/service.py", line 696, in _message_cb
    retval = candidate_method(self, *args, **keywords)
  File "/usr/lib/python2.5/site-packages/jockey/backend.py", line 326, in set_enabled
    return self._f_result
AttributeError: 'Backend' object has no attribute '_f_result'