ios - iOS 6.1 のウィンドウ階層にないビュー

Question

このエラーを受け取ります。

2013-02-28 16:19:49.628 VLC[1416:907] 警告: ウィンドウ階層にないビューで表示しようとしています!

これは私のコードです

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // This will mark crashy files
    [[MLMediaLibrary sharedMediaLibrary] applicationWillStart];

    [_window addSubview:self.navigationController.view];
    [_window setRootViewController:self.navigationController];
    [_window makeKeyAndVisible];


    NSURL * urlToOpen = [launchOptions objectForKey:UIApplicationLaunchOptionsURLKey];
    urlToOpen = [NSURL URLWithString:@"rtsp://192.168.4.123"];

    if (urlToOpen != nil) {
        // We were started to open a given URL
        MVLCMovieViewController * movieViewController = [[MVLCMovieViewController alloc] init];
        movieViewController.url = urlToOpen;

        [self.navigationController presentViewController:movieViewController animated:YES completion:NULL];
        [movieViewController release];
    }

    return YES;
}