iOS 5 Programming Cookbook source doesn't work

That's not giving us alot dude..
Tried setting breakpoints etc, to see where it blocks, because this is nice for us to see (you haven't given a title/author/what source though..).
And you haven't showed any code, how can we even try helping?

 

Have you bothered to look at the console?
"Applications are expected to have a root view controller at the end of application launch"

Also, what are you expecting to happen?

Code:

- (BOOL)            application:(UIApplication *)application
  didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
  
  [self addAlarmToCalendar];
  
  self.window = [[UIWindow alloc] initWithFrame:
                 [[UIScreen mainScreen] bounds]];
  
  self.window.backgroundColor = [UIColor whiteColor];
  [self.window makeKeyAndVisible];
  return YES;
}