Ошибка новичка Apple Mach-O Linker Error

Я здесь довольно новый, но у меня ошибка Apple Mach-O Linker: ошибка

Это мой делегат приложения! ////AppDelegate.m//VCContainmentTut////Создано A Khan 01/05/2013. // Авторское право (c) 2013 год. Все права защищены. //

#import "AppDelegate.h"
#import "RootController.h"
#import "ViewController.h"
#import "VidViewController.h"
#import "SelectVideo1.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

    VidViewController *vidViewController = [[VidViewController alloc] init];
    UINavigationController *navController1 = [[UINavigationController alloc] initWithRootViewController:vidViewController];
[self.window setRootViewController:navController1];

    SelectVideo1 *selectVideo1 = [[SelectVideo1 alloc] initWith:@"Movie Trailers"];
    //[self.navController pushViewController:selectVideo1 animated:YES];


    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    UIStoryboard *tabStoryBoard = [UIStoryboard storyboardWithName:@"TabStoryboard" bundle:nil];
    UIStoryboard *navStoryBoard = [UIStoryboard storyboardWithName:@"NavStoryboard" bundle:nil];
    UINavigationController *navController = [navStoryBoard instantiateViewControllerWithIdentifier:@"Nav Controller"];
    UITabBarController *tabController = [tabStoryBoard instantiateViewControllerWithIdentifier:@"Tab Controller"];
    ViewController *redVC, *greenVC;
    redVC = [[ViewController alloc] init];
    greenVC = [[ViewController alloc] init];

    redVC.view.backgroundColor = [UIColor redColor];
    greenVC.view.backgroundColor = [UIColor greenColor];

    RootController *menuController = [[RootController alloc]
                                      initWithViewControllers:@[tabController, redVC, greenVC, navController, selectVideo1]
                                      andMenuTitles:@[@"Cheats", @"Videos", @"WalkThroughs", @"Nav"]];
    self.window.rootViewController = menuController;
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}



@end