def play_track(self, track):
        log.debug('Playing new track')
        log.debug('Stopping player')
        self.player.set_state(gst.STATE_NULL)
        log.debug('Reconfiguring player...')
        if self.track.local:
            self.create_player('local')
            self.filesrc.set_property("location", track.url)
        else:
            self.create_player('vkont')
            self.bufsrc.set_track(track)
        log.debug('Starting player...')
        self.player.set_state(gst.STATE_PLAYING)


when it rungs i get this:
00:25:21 DEBUG player.py:94: Playing new track
00:25:21 DEBUG player.py:96: Stopping player
/home/a2k/prog/vplayer/player.py:97: Warning: invalid uninstantiatable type `(null)' in cast to `GObject'
  self.player.set_state(gst.STATE_NULL)
00:25:21 DEBUG player.py:99: Reconfiguring player...
00:25:21 DEBUG player.py:106: Starting player...
/home/a2k/prog/vplayer/player.py:107: Warning: invalid uninstantiatable type `(null)' in cast to `GObject'
  self.player.set_state(gst.STATE_PLAYING)