Traceback (most recent call last):
  File "/usr/bin/kickoff-player", line 109, in <module>
    player = KickoffPlayer()
  File "/usr/bin/kickoff-player", line 56, in __init__
    self.player   = PlayerHandler(self)
  File "/opt/kickoff-player-git/handlers/player.py", line 42, in __init__
    self.playbin = GstBox(callback=self.update_status)
  File "/opt/kickoff-player-git/widgets/gstbox.py", line 22, in __init__
    self.swidget = self.gtksink.props.widget
AttributeError: 'NoneType' object has no attribute 'props'