I ctrl dragged the nav bar item from a view controller in storyboard, to the view controller header file and named it IBOutlet 'navItem'. After a while, I deleted this. navItem no longer exists as a property in my header file (or implementation file). Yet i'm getting the following error message whenever I attempt to segue to this view controller 2012-01-23 19:26:42.173 Opthalmology Quiz[8363:707] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<AnswerDViewController 0x199350> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key navItem.' How do I fix this?