I realize this is an old post, but it showed up at the top of a google search and I was able to solve my problem by reading the comments. Just to pay it forward...
This is a problem that can occur when you have a bad connection from your storyboard to the view controller. In my case, I'd connected a button to an outlet, then deleted the outlet, leaving a dangling connection. I was able to fix it fairly easily by ctrl+clicking the view in the storyboard, visually inspecting the connections listed, and then deleting the one that was no longer valid. I'm sure there are other ways to fix the error, but that's what worked for me.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…