MPMoviePlayerController错误_itemFailedToPlayToEnd同时播放YouTube视频iOS 7

我正在使用ALMovieplayercontroller库.一切都很好,但是当我试图播放Youtube视频时,它会给我错误.

_itemFailedToPlayToEnd：{
kind = 1;
new = 2;
老= 0;
}

编辑

- (void)setContentURL:(NSURL *)contentURL {

    self.moviesourceType = MPMoviesourceTypeStreaming;
    [super setContentURL:contentURL];
    [[NsnotificationCenter defaultCenter] postNotificationName:ALMoviePlayerContentURLDidChangeNotification object:nil];
    [self play];
}

这是我的代码

ALMoviePlayerControls *movieControls = [[ALMoviePlayerControls alloc] initWithMoviePlayer:self.moviePlayer style:ALMoviePlayerControlsStyleDefault];
//[movieControls setAdjustsFullscreenImage:NO];
[movieControls setBarColor:[UIColor colorWithRed:195/255.0 green:29/255.0 blue:29/255.0 alpha:0.5]];
[movieControls setTimeRemainingDecrements:YES];

//assign controls
[self.moviePlayer setControls:movieControls];
[self.view addSubview:self.moviePlayer.view];
self.moviePlayer.moviesourceType = MPMoviesourceTypeStreaming;

//THEN set contentURL
[self.moviePlayer setContentURL:[NSURL URLWithString:@"http://www.youtube.com/watch?v=NaosmaGx8NM"]];

我无法找到解决方案.

请帮忙.