title: Set Time from one ViewController to one ViewController
body: <p>My App crashed because  I set time from one ViewController to one ViewController in AppDelegate.m for method below and it show the message : unrecognized selector sent to instance 0x6a0e360. </p>
  
  <pre><code>-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
      [self performSelector:@selector(toSecondViewController:) withObject:nil afterDelay:5];
  }
  
  -(void)toSecondViewController{
      SecondViewController *second = [[SecondViewController alloc] init];
      [self.navigationController pushViewController:sale animated:YES];
  }
  </code></pre>
  
  <p>I don't know why ?</p>