ContactListView: Action:'Remove' activated
TpGroup: Failed to remove member: Traceback (most recent call last):
  File "/var/lib/python-support/python2.4/dbus/service.py", line 655, in _message_cb
    retval = candidate_method(self, *args, **keywords)
  File "/usr/lib/python2.4/site-packages/telepathy_butterfly/channel.py", line 180, in RemoveMembers
    added = set()
  File "/var/lib/python-support/python2.4/dbus/decorators.py", line 289, in emit_signal
    message.append(signature=signature, *args)
TypeError: Expected a string or unicode object