I do video editing program mainly synthetic, at the result page, when call AVPlayerViewController to preview the video.Sometimes after the method viewWillAppear, about 9 seconds later, I got follow error

[default] AudioSessionCopyProperty_Priv posting message to kill mediaserverd (3705)
[avas] AVAudioSessionUtilities.h:114   AudioSessionGetProperty ('rcid') failed with error: 'what'
[avas] AVAudioSessionUtilities.h:138   AudioSessionGetProperty ('rcid') failed with error: 'what',
the 

and then, or system avplayers (not only in my app), will change its status to error, and can not play again. Does anyone know what happend?