Delegate must respond to locationManager:didFailWithError: even though implemented didFailWithError method

For some reason Xcode thinks I'm not implementing didFailWithError method of the CLLocationManagerDelegate protocol

I fail to see what I'm doing wrong, as I literally copied from another SO post that said this didFailWithErrormethod was updated for Swift 3. So I don't understand why Xcode thinks I'm not implementing didFailWithError

Any insight would be greatly appreciated!

Code

class OptionsViewController: UIViewController,
    CLLocationManagerDelegate {
var locationManager: CLLocationManager = CLLocationManager()

    override func viewDidLoad() {
//Ask user for location
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        
        //Use users current location if no starting point set
        if CLLocationManager.locationServicesEnabled() {
            if CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedWhenInUse
                || CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedAlways {
                locationManager.requestLocation()
            }
            else{
                locationManager.requestWhenInUseAuthorization()
            }
        }
        else{
            //Alert user to open location service, bra bra bra here...
        }
    }

func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        print("error:: \(error)")
    }
    
    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        print("didChangeAuthorization")
        if status == CLAuthorizationStatus.authorizedWhenInUse
            || status == CLAuthorizationStatus.authorizedAlways {
            locationManager.requestLocation()
        }
        else{
            //other procedures when location service is not permitted.
        }
    }
    
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        print("Did update location called")
//        let locValue:CLLocationCoordinate2D = manager.location!.coordinate
//        print("locations = \(locValue.latitude) \(locValue.longitude)")
        if locations.first != nil {
            print("location:: (location)")
        }
        
    }

Aaaandd I realized it's b/c I needed to use an Error of a specific type (specifically Swift.Error) This is the right method declaration for didFailWithError:

func locationManager(_ manager: CLLocationManager, didFailWithError error: Swift.Error) {