2008-04-07 17:59:42,597 ERROR    [notifier.async] async.py 318: Unhandled InProgress exception:
Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/kaa/notifier/coroutine.py", line 129, in newfunc
    result = _process(function, async)
  File "/usr/lib/python2.5/site-packages/kaa/notifier/coroutine.py", line 79, in _process
    return func.throw(*async._exception)
  File "/usr/lib/python2.5/site-packages/freevo/ui/video/player.py", line 103, in play
    yield self.player.open(self.item.url, player=player)
AsyncException: Exception raised asynchronously; traceback follows:
  File "/usr/lib/python2.5/site-packages/kaa/notifier/coroutine.py", line 129, in newfunc
    result = _process(function, async)
  File "/usr/lib/python2.5/site-packages/kaa/notifier/coroutine.py", line 81, in _process
    return func.next()
  File "/usr/lib/python2.5/site-packages/kaa/popcorn/generic.py", line 235, in _open
    cls = backends.manager.get_player_class(self.media, self._open_caps, exclude, player, self._window)
  File "/usr/lib/python2.5/site-packages/kaa/popcorn/backends/manager.py", line 115, in get_player_class
    cls._player_caps = [ x for x in player_caps.keys() if x ]
AttributeError: 'NoneType' object has no attribute 'keys'