I made up my own iAP2-BT-device, which is perfectly running by use the BT-list and the External Accessory Framework. Now, following the instruction for MFI developers, I would like to show the showBluetoothAccessoryPicker using the following swift code: EAAccessoryManager.shared().showBluetoothAccessoryPicker(withNameFilter: nil) { (error) in if let error = error { switch error { case EABluetoothAccessoryPickerError.alreadyConnected: break default: break } } } Wherever I put this snipple in my app code the picker is never shown (device unpaired by forget device) and I always get the console message: A constraint factory method was passed a nil layout anchor. This is not allowed, and may cause confusing exceptions. Break on BOOL _NSLayoutConstraintToNilAnchor(void) to debug. This will be logged only once. This may break in the future. I have no idea what to do to get this picker shown ... Thanks for your help