title: Unable to play MP4 video file from mainBundle
body: <p>So I'm trying to play a simple intro animation video file that I've dragged into my project in XCode and therefore should be able to play from my mainBundle, right?</p>
  
  <p>With this code:</p>
  
  <pre><code> NSURL *urlString = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"introvideo" ofType:@"mp4"]]; 
  MPMoviePlayerController *player  = [[MPMoviePlayerController alloc] initWithContentURL:urlString];
  [player play];
  </code></pre>
  
  <p>I get this error message:
  <strong>* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*</strong> -[NSURL initFileURLWithPath:]: nil string parameter'</p>
  
  <p>Any help would be great!</p>