Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/pymsn/client.py", line 265, in property_changed
    self._dispatch(method_name, contact)
  File "/usr/lib/python2.5/site-packages/pymsn/event/__init__.py", line 44, in _dispatch
    if event_handler._dispatch_event(name, *args):
  File "/usr/lib/python2.5/site-packages/pymsn/event/__init__.py", line 65, in _dispatch_event
    handler(*params)
  File "/usr/lib/python2.5/site-packages/butterfly/aliasing.py", line 98, in on_contact_memberships_changed
    handle = ButterflyHandleFactory(self._conn_ref(), 'contact',
AttributeError: 'ButterflyConnection' object has no attribute '_conn_ref'