Universal app not working on iPad

I have build an universal application which works perfec开发者_JAVA技巧tly in iPhone Simulator. But the application crashes in iPad simulator. The execution does not enter in to the AppDelegate of the iPad itself. It doesn't throw any errors or anything just doesn't do anything.

Also, I've seen people get this wrong by not having the "Target Device Family" build setting set correctly.

Problem solved ... somehow in .xib the delegate wasn't connected to File's Owner. Silly mistake. Thank you for your answers