Unable to run the code on device - objective-c

Question

I am trying to merge videos and the code is running fine on simulator. I am able to merge videos,
but when I run the same code on device it gives me this exception
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[__NSArrayM insertObject:atIndex:]: object cannot be nil
the code is here :
AVMutableComposition *mixComposition = [AVMutableComposition composition]; AVMutableCompositionTrack *compositionTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; NSError * error = nil; NSMutableArray * timeRanges = [NSMutableArray arrayWithCapacity:videoClipPaths.count]; NSMutableArray * tracks = [NSMutableArray arrayWithCapacity:videoClipPaths.count]; for (int i=0; i<[videoClipPaths count]; i++) { AVURLAsset *assetClip = [AVURLAsset URLAssetWithURL:[videoClipPaths objectAtIndex:i] options:nil]; AVAssetTrack *clipVideoTrackB = [[assetClip tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
[timeRanges addObject:[NSValue valueWithCMTimeRange:CMTimeRangeMake(kCMTimeZero, assetClip.duration)]];
[tracks addObject:clipVideoTrackB];
}
NSLog(#"HELLO: %#", timeRanges );
[compositionTrack insertTimeRanges:timeRanges ofTracks:tracks atTime:kCMTimeZero error:&error];
AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality];
// NSParameterAssert(exporter != nil);
NSArray *t; NSString *u;
t = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
u = [t objectAtIndex:0];
NSString *finalPath = [u stringByAppendingPathComponent:#"final.mov"];
NSURL *lastURL = [NSURL fileURLWithPath:finalPath];
exporter.outputFileType = AVFileTypeQuickTimeMovie;
exporter.outputURL = lastURL;
[exporter exportAsynchronouslyWithCompletionHandler:^(void){
switch (exporter.status) {
case AVAssetExportSessionStatusFailed:
NSLog(#"exporting failed");
[SVProgressHUD dismiss];
break;
case AVAssetExportSessionStatusCompleted:
NSLog(#"exporting completed");
UISaveVideoAtPathToSavedPhotosAlbum(finalPath, self, nil, NULL);
[SVProgressHUD dismiss];
break;
case AVAssetExportSessionStatusCancelled:
NSLog(#"export cancelled");
break;
}
}];

Answer 1

Most likely your app is using some file that is resident on your Mac but you have not installed and properly addressed on the phone.
But, in any event, log "tracks" as well as well as "timeRanges".