Question

I’m following Apple’s Core Data Tutorial for iOS and am having issues pretty early on when I have to build the application for the first time at the Build and Test step.

I’m building this with Xcode 4.2 and iOS 5.

Here is my source

Answer 1

You didn’t create the app window.

Add this line:

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

on the top of

application didFinishLaunchingWithOptions