Error create Point in map

Sorry i dont't spea english very well

Please help, i have one error in my code , i don't have apresentation one point in map (the cordenate the point is save one file ) my code :

class mapViewController : UIViewController {
   
    @IBOutlet weak var mapView: MKMapView!
    /
    func getFilepath() -> String
    {
        let userDomainPaths: NSArray = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
       
        let filepath: String = userDomainPaths.objectAtIndex(0) as! String
       
        return "\(filepath)/afMyLocation.plist"
    }
    /
    /
   
   
   
    /
   
    override func viewDidLoad() {
        super.viewDidLoad()
        print("LOG : Map carregado com sucesso")
        /
       
       
        let FLatitude : Double?
        let FLongitude : Double?
       
        let filepathAux: String = self.getFilepath()
        if(NSFileManager.defaultManager().fileExistsAtPath(filepathAux) == true) {
            print("Verificou se existe arquivo - crioui cordenadas")
            let array: NSArray = NSArray(contentsOfFile: filepathAux)!
            let FLatitude : String?
            let FLongitude : String?
            FLatitude = (array.objectAtIndex(0) as? String)!
            FLongitude = (array.objectAtIndex(1) as? String)!
                    } else {
            print("Erro ao recuperar posicao")
            /
        }
       
        /
        /
            /
       
        /
            let location = CLLocationCoordinate2D(
                latitude: 51.50007773,
                longitude: -0.1246402
            )
            /
            let span = MKCoordinateSpanMake(0.05, 0.05)
            let region = MKCoordinateRegion(center: location, span: span)
            mapView.setRegion(region, animated: true)
           
            /
            let annotation = MKPointAnnotation()
            annotation.coordinate = location
            annotation.title = "Big Ben"
            annotation.subtitle = "London"
            mapView.addAnnotation(annotation)
        }
        }
       
        /
        /
       
        /
                /
      

How can fix ?

Sorry my comunication

Thank