Terminate called throwning an exception - objective-c

Question

I have make a piece of code for playing a video file. But when i build it i get the folowing error:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: ' -[NSURL initFileURLWithPath:]: nil string parameter'
First throw call stack:
(0x1ed8022 0x11c0cd6 0x1e80a48 0x1e809b9 0xc6553b 0xc654c5 0x2be8 0x1ed9e99 0x32614e 0x3260e6 0x3ccade 0x3ccfa7 0x3cc266 0x34b3c0 0x34b5e6 0x331dc4 0x325634 0x17baef5 0x1eac195 0x1e10ff2 0x1e0f8da 0x1e0ed84 0x1e0ec9b 0x17b97d8 0x17b988a 0x323626 0x29b2 0x2925)
terminate called throwing an exception
I have tried a lot to fix it but nothing does work! Do you no a solution? And yes, i have implementated the mediaplayer framework!
I have coded the follwing code:
-(IBAction)playvideo {
NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle]
pathForResource:#"film" ofType:#"mp4"]];
MPMoviePlayerViewController *playercontroller = [[MPMoviePlayerViewController alloc]
initWithContentURL:url];
[self presentMoviePlayerViewControllerAnimated:playercontroller];
playercontroller.moviePlayer.movieSourceType = MPMovieSourceTypeFile;
[playercontroller.moviePlayer play];
[playercontroller release];
playercontroller = nil;
}

Answer 1

The problem is described in this line:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: ' -[NSURL initFileURLWithPath:]: nil string parameter'
Which is telling you that you are passing a nil into a parameter that doesn't allow a nil.
Steps to be sure that this is the problem:
-(IBAction)playvideo {
NSString *videoPath = [[NSBundle mainBundle] pathForResource:#"film" ofType:#"mp4"]
if (!videoPath) {
NSLog(#"Video path is nil. My bundle must be set up incorrectly");
return; // return early.
}
NSURL *url = [NSURL fileURLWithPath:videoPath];
MPMoviePlayerViewController *playercontroller = [[MPMoviePlayerViewController alloc]
initWithContentURL:url];
// The rest of your implementation here.
}
This should at least help you to localise the problem.
As an aside - you should be using the URL based methods for getting resources instead of string based file-paths. But one thing at a time.