@IBDesignable error: IB Designables: Failed to update auto layout status: Interface Builder Cocoa Touch Tool crashed

There are crash reports generated when Interface Builder Cocoa Touch Tool crashes. Theses are located in ~/Library/Logs/DiagnosticReports and named IBDesignablesAgentCocoaTouch_*.crash. In my case they contained a useful stack-trace that identified the issue in my code.

I have had the same issue a couple of times. Both times it started when I was loading an IBDesignable nib onto the storyboard when the nib was not able to fit on the view (ie I had a button off of the UIView but still in the nib). Once I fixed that Xcode still gave me errors so I restarted Xcode until it randomly stopped giving me the error.

I hope this helps.

UPDATE: I just killed all processes named "Interface Builder Cocoa Touch Tool", restarted Xcode and the error went away. Don't know if this will always work or not.