Traceback (most recent call last):
  File "/usr/share/software-center/piston_generic_helper.py", line 192, in <module>
    token = helper.get_oauth_token_and_verify_sync()
  File "/usr/share/software-center/piston_generic_helper.py", line 131, in get_oauth_token_and_verify_sync
    token = self.get_oauth_token_sync()
  File "/usr/share/software-center/piston_generic_helper.py", line 126, in get_oauth_token_sync
    sso.login_or_register()
  File "/usr/share/software-center/softwarecenter/backend/login_sso.py", line 74, in login_or_register
    self.proxy.register(self.appname, self._get_params())
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 70, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name :1.284 was not provided by any .service files