Applications are expected to have a root view controller at the end of application launch

Question

I get the following error in my console:

Applications are expected to have a root view controller at the end of application launch

Answer 1

This occurred for me because i inadvertently commented out:

[self.window makeKeyAndVisible];

from

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