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I have this same problem, but for me it only occurs when I run on an iOS 12 phone, compiling using XCode 11.2If I run on an iOS 13 phone it's all good.On iOS12 I get:2019-12-02 14:31:41.680401+1300 CCP.iOS[608:60415] Unknown class _TtC7CCP_iOS29BluetoothActionViewController in Interface Builder file.2019-12-02 14:31:41.696401+1300 CCP.iOS[608:60415] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x1021777d0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key _actionView.'Note: My ViewController is called BluetoothActionViewController, and it has an outlet@IBOutlet weak var _actionView: UIView!I don't think my storyboard is wrong because it does compile and run correctly all on an iOS 13 phone.Is there some workaround to enable this to work on iOS 12? I hope so