gerror = gobject.GError()
                gerror.message = error_msg
                msg = gst.message_new_error(src=elt, error=gerror,
                                            debug=error_msg)

error i get:

         File "/home/phil/devel/elisa/trunk/elisa/core/player/player.py", line 226, in on_message
            debug=error_msg)
        exceptions.TypeError: error should be a GError