IOS [NSURL initFileURLWithPath:]: nil string parameter on loading video - iphone

Question

I have a problem with my video content. I want to load a video from my viewcontroller and I get this error:
[NSURL initFileURLWithPath:]: nil string parameter
When I try to load the video from a url the video wont show up.
I am sure that my variable targetURN is not nil.
From here I load my viewcontroller:
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
switch (buttonIndex) {
case 0:
[self openVideoView:#"Video"];
break;
case 1:
[self openWebview:#"About"];
break;
case 2:
[self openWebview:#"http://www.url.com"];
break;
}
}
- (void)openVideoView:(NSString *)url{
IDPVideoView *vv = [[IDPVideoView alloc] initWithURN:url];
[self presentModalViewController:vv animated:NO];
}
In my viewcontroller:
- (void)viewDidLoad
{
[super viewDidLoad];
NSURL *videoURL = nil;
if ([self.targetURN hasPrefix:#"http"])
{
videoURL = [NSURL URLWithString:targetURN];
}
else
{
videoURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:targetURN ofType:#"mp4"]];
}
if(videoURL != nil) {
MPMoviePlayerController *moviePlayer =
[[MPMoviePlayerController alloc] initWithContentURL:videoURL];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(moviePlayBackDidFinish:) name:MPMoviePlayerPlaybackDidFinishNotification object:moviePlayer];
moviePlayer.controlStyle = MPMovieControlStyleDefault;
moviePlayer.shouldAutoplay = YES;
[moviePlayer prepareToPlay];
[self.view addSubview:moviePlayer.view];
[moviePlayer setFullscreen:YES animated:YES];
}
}

Answer 1

have you tried allocating the url first?
NSURL *vidURL = [[NSURL alloc] initWithString:self.targetURN];
as a general advice, try using self.targetURN all the time, or synchronize it to a different name like
#synchronize targetURN = _targetURN
and then use _targetURN in your code.this makes sure that you (in any case) use the right property.
(of course this goes for all your properties)

Answer 2

I solved the error part by adding this line
NSString *urlString = [NSString stringWithFormat:url];
- (void)openVideoView:(NSString *)url{
NSString *urlString = [NSString stringWithFormat:url];
IDPVideoView *vv = [[IDPVideoView alloc] initWithURN:url];
[self presentModalViewController:vv animated:NO];
}
But the video is still not showing up.