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Use of unresolved indentifier - MapKit, user location

I'm trying to get the user location to appear in the user interface, but the use of unresolved identifier keeps appearing... Any heads up on how to fix this, please? Muy danke! p.s The error occurs on the line of let region:MKCoordinateRegion = MKCoordinateRegionMake(myLocation, span).

import UIKit import MapKit import CoreLocation

class SecondViewController: UIViewController, CLLocationManagerDelegate {

@IBOutlet weak var map: MKMapView!

let manager = CLLocationManager()

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{   let location = locations[0]

    let span:MKCoordinateSpan = MKCoordinateSpanMake(0.01, 0.01)

    let myLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)

    let region:MKCoordinateRegion = MKCoordinateRegionMake(myLocation, span)

    self.map.showsUserLocation = true


override func viewDidLoad()
    manager.delegate = self
    manager.desiredAccuracy = kCLLocationAccuracyBest

     map.setRegion(region, animated: true)

override func didReceiveMemoryWarning() {
    // Dispose of any resources that can be recreated.

// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.