Использование Parse.com чтобы загрузить видео

Я новичок в синтаксическом анализе и пытаюсь сохранить и загрузить видео в облако. Это код, который я использую, но он продолжает получать ошибку, когда вызывается doneButtonAction. Я считаю, что проблема заключается в том, что видео сохраняется в виде файла, но я понятия не имею, как это исправить. Заранее благодарю вас -

- (void)imagePickerController:(UIImagePickerController *)picker      didFinishPickingMediaWithInfo:(NSDictionary *)info {

    NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
    NSLog(@"%@", videoURL);


    if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum (self.moviePath))
    {
        UISaveVideoAtPathToSavedPhotosAlbum (self.moviePath, nil, nil, nil);
    }

    [self shouldUploadVideo];
    [self doneButtonAction];
}

- (void)shouldUploadVideo {

    //Capturamos el NSUserdefault para grabar el evento
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSString *loadstring = [defaults objectForKey:@"Video"];
    NSLog(@"Working at first line");



    NSData *videoData = [NSData dataWithContentsOfURL:self.videoURL];
    NSLog(@"Working at second line");


    PFFile *videoFile = [PFFile fileWithData:videoData];
    NSLog(@"Working at third line");

    [self.videoFile saveInBackground];
    NSLog(@"Working at last line");

}

- (void)doneButtonAction {
    // Make sure there was no errors creating the image files
    if (!self.videoFile) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Couldn't save your photo"
                                                       message:nil
                                                       delegate:nil
                                              cancelButtonTitle:nil
                                              otherButtonTitles:@"Dismiss",nil];
        [alert show];
        return;
    }

    // Create a Photo object
    PFObject *video = [PFObject objectWithClassName:kPAPPhotoClassKey];
    [video setObject:[PFUser currentUser] forKey:kPAPPhotoUserKey];
    [video setObject:self.videoFile forKey:@"Video"];

    // Request a background execution task to allow us to finish uploading
    // the photo even if the app is sent to the background
    self.photoPostBackgroundTaskId = [[UIApplication sharedApplication]   beginBackgroundTaskWithExpirationHandler:^{
        [[UIApplication sharedApplication] endBackgroundTask:self.photoPostBackgroundTaskId];
    }];

    // Save the Photo PFObject
    [video saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
        if (succeeded) {
            NSLog(@"Photo uploaded");

            // Add the photo to the local cache
            [[PAPCache sharedCache] setAttributesForPhoto:video likers:[NSArray array] commenters:[NSArray array] likedByCurrentUser:NO];

            // Send a notification. The main timeline will refresh itself when caught
            [[NSNotificationCenter defaultCenter] postNotificationName:PAPTabBarControllerDidFinishEditingPhotoNotification object:video];
        } else {
            NSLog(@"Photo failed to save: %@", error);
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Couldn't post your photo"
                                                            message:nil
                                                           delegate:nil
                                                  cancelButtonTitle:nil
                                                  otherButtonTitles:@"Dismiss",nil];
            [alert show];
        }

        // If we are currently in the background, suspend the app, otherwise
        // cancel request for background processing.
        [[UIApplication sharedApplication] endBackgroundTask:self.photoPostBackgroundTaskId];
    }];

    // Dismiss this screen
    [self.parentViewController dismissViewControllerAnimated:YES completion:nil];

}