Catching MPMoviePlayerController Errors

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I'm having problems with a movie player that I made using MPMoviePlayerController. I used code from one of Apple's examples and it works fine, however if I give a bad URL (like "null") then the App crashed. How can I catch all of the errors from the MPMoviePlayer controller? I don't see much in the class reference document.

I get this error:
2009-07-30 03:08:05.091 Spectacular[5643:20b] Movie URL = null
2009-07-30 03:08:05.094 Spectacular[5643:20b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid content URL provided to MPMoviePlayerController (null). Use +[NSURL fileURLWithPath:] for local movie files.'

My code:

-(void)initAndPlayMovie:(NSURL *)movieURL
{
	NSLog(@"Init and play movie called!");
	NSLog(@"Movie URL = %@", movieURL);
	// Initialize a movie player object with the specified URL
	MPMoviePlayerController *mp = [[MPMoviePlayerController alloc] initWithContentURL:movieURL];
	NSLog(@"MPPLayer = %@", mp);
	if (mp)
	{
		NSLog(@"MP Success!");
		// save the movie player object
		self.moviePlayer = mp;
		[mp release];
		
		// Apply the user specified settings to the movie player object
		[self setMoviePlayerUserSettings];
		
		// Play the movie!
		[self.moviePlayer play];
	}
}

[blueFLoyd8]

I would also like to figure this out. Anyone familiar with the problem?

[blueFLoyd8]

From the class reference:
Because it takes time to load movie files into memory, this class automatically begins loading your movie file shortly after you initialize a new instance. When it is done preloading the movie file, it sends the MPMoviePlayerContentPreloadDidFinishNotification notification to any registered observers. If an error occurred during loading, the userInfo dictionary of the notification object contains the error information. If you call the play method before preloading is complete, no notification is sent and your movie begins playing as soon as it is loaded into memory.

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This is the line of code that causes me errors:
MPMoviePlayerController *mp = [[MPMoviePlayerController alloc] initWithContentURL:movieURL];

An exception is getting thrown and the App quits because it was not caught. However, how can I catch it?