sudo jockey-gtk 
(jockey-gtk:3374): Gtk-CRITICAL **: gtk_icon_set_render_icon_pixbuf: assertion `icon_set != NULL' failed

(jockey-gtk:3374): Gtk-CRITICAL **: gtk_icon_set_render_icon_pixbuf: assertion `icon_set != NULL' failed
Traceback (most recent call last):
  File "/usr/bin/jockey-gtk", line 418, in <module>
    sys.exit(u.run())
  File "/usr/lib/python2.7/dist-packages/jockey/ui.py", line 468, in run
    self.ui_show_main()
  File "/usr/bin/jockey-gtk", line 94, in ui_show_main
    self.update_tree_model()
  File "/usr/bin/jockey-gtk", line 275, in update_tree_model
    info = self.get_ui_driver_info(h_id)
  File "/usr/lib/python2.7/dist-packages/jockey/ui.py", line 295, in get_ui_driver_info
    info = self.backend().handler_info(handler_id)
  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)
dbus.exceptions.DBusException: org.freedesktop.DBus.Python.TypeError: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/service.py", line 751, in _message_cb
    _method_reply_return(connection, message, method_name, signature, *retval)
  File "/usr/lib/python2.7/dist-packages/dbus/service.py", line 254, in _method_reply_return
    reply.append(signature=signature, *retval)
TypeError: Expected a string or unicode object