Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.7/desktopcouch/application/plugins/ubuntuone_pairing.py", line 117, in listen_to_dbus
    sso_backend.find_credentials(APP_NAME, {})
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 68, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 143, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 620, in call_blocking
    message.append(signature=signature, *args)
ValueError: Unable to guess signature from an empty dict