向地图添加注释时出现Swift错误

Question

我收到错误：EXC_BAD_INSTRUCTION用于此函数的最后两行。在我的代码中，我得到了用户位置，并希望将其用于引脚的位置。提前谢谢！

@IBAction func makeEvent(sender: UIButton)
    {
        self.pointAnnotation1 = MKPointAnnotation()
        self.pointAnnotation1.title = "Event"
        self.pointAnnotation1.coordinate = CLLocationCoordinate2D(latitude: 38.986, longitude: -78.945)
        self.pinAnnotationView = MKPinAnnotationView(annotation: self.pointAnnotation, reuseIdentifier: nil)
        self.mapView.centerCoordinate = self.pointAnnotation.coordinate
        self.mapView.addAnnotation(self.pinAnnotationView.annotation!)
    }