I'm trying to develop a lens for unity in ubuntu 11.10 and I can not get activate_uri signal working. This is an extract of my code:

def _on_activate_uri (self, scop, uri):
    print "----> " + uri + "<-"
    ret=Unity.ActivationResponse.new(Unity.HandledType.HIDE_DASH,'')
    return ret

and this is what I get back:

TypeError: can't convert return value to desired type ../lens/appslens.py:230: Warning: g_object_get_qdata: assertion G_IS_OBJECT (object)' failed GObject.MainLoop().run() ../lens/appslens.py:230: Warning: g_object_set_qdata_full: assertionG_IS_OBJECT (object)' failed GObject.MainLoop().run() ../lens/appslens.py:230: Warning: g_object_unref: assertion `G_IS_OBJECT (object)' failed GObject.MainLoop().run()

Does anyone has an idea where is my mistake ?

Thanks in advance for your help