iOS: How to cleanly delete UIButton outlet? [duplicate]-Collection of common programming errors

Possible Duplicate:
UIAlertView crashes when added to app

I recently tried to delete a UIButton outlet called myButton, but I’m thinking I must have missed something because I now get the following error:

this class is not key value coding-compliant for the key myButton

If I grep the entire project, there are no remaining references to myButton, so I’m not sure how to fix the issue.

How does one get rid of this exception?