升级到xcode7后，Youtube视频无法上传

Question

- (void)uploadTicket:(GDataServiceTicket *)ticket
   finishedWithEntry:(GDataEntryYouTubeVideo *)videoEntry
               error:(NSError *)error
{
    NSLog(@"ticket");

    UIButton *uploadButton = (UIButton *)[backgroundImage viewWithTag:10];
    UIButton   *cancleButton = (UIButton *)[backgroundImage viewWithTag:20];
    if (error == nil)
    {
        // tell the user that the add worked


        NSLog(@"Video Successfully Uploaded to Youtube");

        NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
        NSNumber *uploadedToYouTube = [defaults objectForKey:@"uploadedToYouTube"];
        if(nil == uploadedToYouTube)
        {
            [defaults setObject:[NSNumber numberWithBool:YES] forKey:@"uploadedToYouTube"];
            [defaults synchronize];
        }

        NSNumber *userOpenedYoutubeView = [defaults objectForKey:@"userOpenedYoutubeToUnlockTheme"];
        if(nil != userOpenedYoutubeView)
        {
            // [defaults setBool:NO forKey:@"Unlock_Theme"];
            [defaults setObject:[NSNumber numberWithBool:NO] forKey:@"Unlock_Theme"];
            [defaults synchronize];

            UIAlertView *alrtView = [[UIAlertView alloc] initWithTitle:@"Congrats...!" message:@"Your new theme is Unlocked" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [alrtView show];
            [alrtView release];

             [self removeFromSuperview];
        }
        else
        {
            UIAlertView *alrtView = [[UIAlertView alloc] initWithTitle:@"Success...!" message:@"Your Video is successfully uploaded to Youtube" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [alrtView show];
            [alrtView release];

            [self removeFromSuperview];
        }

    }
    else {



        NSLog(@"Fails to upload Video to Youtube");

        UIAlertView *alrtView = [[UIAlertView alloc] initWithTitle:@"Sorry" message:@"Fails to upload video to Youtube. Please try again" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alrtView show];
        [alrtView release];

    }

    mProgressView . hidden = YES;
    uploadButton . hidden = NO;
    cancleButton . enabled = YES;

    [mProgressView setProgress: 0.0];

    [self setUploadTicket:nil];
}

每次我尝试上传时都会显示警告消息“上传失败”。我不明白为什么会这样表现出来。在升级到Xcode 7之前，它工作正常。任何人都知道请帮助我。