title: Assertion failure in -[UIApplication _runWithMainScene:transitionContext:completion:],
body: <p>I am getting the following error in iOS9 only.</p>
  
  <p>Here is my code:-</p>
  
  <pre><code>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
  {     
      self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
      if ([[NSUserDefaults standardUserDefaults] objectForKey:@"login_dict"])
      {
           if ([[NSUserDefaults standardUserDefaults]  objectForKey:@"isLogout"] == nil || [[[NSUserDefaults standardUserDefaults] objectForKey:@"isLogout"] integerValue]== 0)
           {
              self.loginDict = [[BaseViewController sharedInstance] removeNullFromDictionary:[[NSUserDefaults standardUserDefaults] objectForKey:@"login_dict"]];
              self.firstViewController = [[HomeViewController alloc] initWithNibName:@"HomeViewController" bundle:nil];
           }
           if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"isLogout"] integerValue]== 1)
           {
              self.firstViewController = [[WelcomeViewController alloc] initWithNibName:@"WelcomeViewController" bundle:nil];
           }
           NSLog(@"Userinfo = %@",self.loginDict);
      }
      else
      {
          self.firstViewController = [[WelcomeViewController alloc] initWithNibName:@"WelcomeViewController" bundle:nil];
      }
  
      self.window.backgroundColor = [UIColor whiteColor];
      [self.window makeKeyAndVisible];
  
       self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
       self.navigationController = [[BufferedNavigationController alloc] initWithRootViewController:self.firstViewController];
       //[window makeKeyAndVisible];
  
      [self.window setRootViewController:self.navigationController];
  }
  </code></pre>
  
  <p>Note : This code is working fine in Xcode 6.4 and iOS8. </p>
  
  <pre><code> Assertion failure in -[UIApplication _runWithMainScene:transitionContext:completion:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3505.16/UIApplication.m:3294
  </code></pre>