Rhyhtmbox crashing from Ubuntu One plug-in

Traceback (most recent call last):
  File "/usr/lib/rhythmbox/plugins/ubuntuone/ubuntuone.py", line 24, in <module>
    from MusicStoreWidget import U1MusicStoreWidget, U1LIBRARYPATH
  File "/usr/lib/rhythmbox/plugins/ubuntuone/MusicStoreWidget.py", line 160, in <module>
    class U1Source(RB.Source):
  File "/usr/lib/python2.7/dist-packages/gi/types.py", line 212, in __init__
    super(GObjectMeta, cls).__init__(name, bases, dict_)
  File "/usr/lib/python2.7/dist-packages/gi/_gobject/__init__.py", line 65, in __init__
    cls._type_register(cls.__dict__)
  File "/usr/lib/python2.7/dist-packages/gi/_gobject/__init__.py", line 119, in _type_register
    type_register(cls, namespace.get('__gtype_name__'))
TypeError: Error when calling the metaclass bases
    __gsignals__ keys must be strings

(rhythmbox:6973): libpeas-WARNING **: Error loading plugin 'ubuntuone'

(rhythmbox:6973): GLib-GObject-WARNING **: invalid cast from `GtkImage' to `U1MusicStore'
zsh: segmentation fault (core dumped) rhythmbox