2016-06-16 02:04:37.586 ParseStarterProject-Swift[1959:117839] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<ParseStarterProject_Swift.ViewController 0x7fcc9bc21f40> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key switch.'

import UIKit

func displayAlert(title: String, message: String) {

    let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)

    alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { (action) in

        self.dismissViewControllerAnimated(true, completion: nil)

    }))

    self.presentViewController(alert, animated: true, completion: nil)

}

var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()

@IBOutlet weak var username: UITextField!

@IBOutlet weak var password: UITextField!

@IBOutlet weak var selector: UISwitch!

@IBOutlet weak var mainButton: UIButton!

@IBOutlet weak var alternateButton: UIButton!

@IBAction func mainButton(sender: AnyObject) {

    if username == "" || password == "" {

        displayAlert("Error in form", message: "Please enter a username and a password")

    } else {

        activityIndicator = UIActivityIndicatorView(frame: CGRect(x: 0, y: 0, width: 50, height: 50))
        activityIndicator.center = self.view.center
        activityIndicator.hidesWhenStopped = true
        activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
        view.addSubview(activityIndicator)
        activityIndicator.startAnimating()
        UIApplication.sharedApplication().beginIgnoringInteractionEvents()

        if selector.on == true {

            // Rider Sign Up

            let user = PFUser()

            user.username = username.text

            user.password = password.text

            user["type"] = "rider"

            user.signUpInBackgroundWithBlock({ (success, error) in

                self.activityIndicator.stopAnimating()
                UIApplication.sharedApplication().endIgnoringInteractionEvents()

                if success == true {

                    // Sign Up Successful

                } else {

                    if let errorString = error!.userInfo["error"] as? String {

                        self.displayAlert("Failed SignUp", message: errorString)

                    }

                }

            })

        } else {

            // Driver Sign Up

            let user = PFUser()

            user.username = username.text

            user.password = password.text

            user["type"] = "driver"

            user.signUpInBackgroundWithBlock({ (success, error) in

                self.activityIndicator.stopAnimating()
                UIApplication.sharedApplication().endIgnoringInteractionEvents()

                if success == true {

                    // Sign Up Successful

                } else {

                    if let errorString = error!.userInfo["error"] as? String {

                        self.displayAlert("Failed SignUp", message: errorString)

                    }

                }

            })


        }

    }

}

@IBAction func alternateButton(sender: AnyObject) {
}

override func viewDidLoad() {
    super.viewDidLoad()
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}