Mobile gestalt support bug in iOS app using fast

Question

I get the following error in my project, and I'm not sure what causes it.

2017-04-04 10:28:39.243789-0500 GBus3[797:148184] libMobileGestalt MobileGestaltSupport.m:153: pid 797 (GBus3) does not have sandbox access for frZQaeyWLUvLjeuEK43hmg and IS NOT appropriately entitled 2017-04-04 10:28:39.243948-0500 GBus3[797:148184] libMobileGestalt MobileGestalt.c:550: no access to InverseDeviceID (see <rdar://problem/11744455>) fatal error: unexpectedly found nil while unwrapping an Optional value 2017-04-04 10:28:43.106075-0500 GBus3[797:148184] fatal error: unexpectedly found nil while unwrapping an Optional value 

I suppose the error occurs when using segue to switch between view controllers.

this is the code to execute segue

  func didTapTrackButton () { performSegue(withIdentifier: "HomeToTrack", sender: self) } 

This is the code to load the second view controller

 override func loadView() { super.loadView() // Building a view let screenFrame = UIScreen.main.bounds let contentView = UIView(frame: screenFrame) // Add Map self.mapView = MKMapView(frame: screenFrame) self.mapView.delegate = self contentView.addSubview(self.mapView) // Set Tracking self.locationManager.delegate = self self.locationManager.requestAlwaysAuthorization() self.mapView.setUserTrackingMode(MKUserTrackingMode.follow, animated: true) // Set the built view as our view self.view = contentView }