Deactivating an audio session with APAudioPlayer

Hiii,
Every time I try to deactivate the AVAudiosession, I get this warning:All I/O should be stopped or paused prior to deactivating the audio session., even though the apaudioplayer instance is stopped.
  Please note also that if I deactivate the audio session on "- (void)playerDidFinishPlaying:(APAudioPlayer *)player", I can not replay the audio anymore.
Please advise
Rana