TERMINATING_DUE_TO_UNCAUGHT_EXCEPTION错误iPhone SDK开发

I have a working program that was written by another programer that I am trying to add some features to in an effort to learn the iPhone SDK. I have carried out what I would assume was a fairly simple task of adding an additional UIButton to an existing view with like buttons. I have used the other UIButtons as a model and it seems this should be a simple task.I have a working program that was written by an