无法将图钉注释添加到地图中

Question

我收到此函数最后两行的错误EXC_BAD_INSTRUCTION。

@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!)
    }