When the user what to sign up or login it has error and get this error in the output "this class is not key value coding-compliant for the key containerView." this is the login code also signup has the same error and l'm sure it's a right codes.

import UIKit
import Firebase

class LoginViewController: UIViewController {

  @IBOutlet var Aemeil: UITextField!
  @IBOutlet var Apassword: UITextField!

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

  @IBAction func login (_ sender : Any){

      guard let email = Aemeil.text, let password = Apassword.text
        else {
            print("Form is not valid")
            return
      }

      Auth.auth().signIn(withEmail: email , password: password , completion: { (user,error) in
        if error == nil{
            let vc = self.storyboard?.instantiateViewController(withIdentifier: "AHome");
            self.present(vc!, animated: true, completion: nil);
            print("Home page open")
        }
        else{
            let alertController = UIAlertController(title: "Error", message: error?.localizedDescription, preferredStyle: .alert)
            let defaultAction = UIAlertAction(title: "Yes", style: .cancel, handler: nil)

            alertController.addAction(defaultAction)
            self.present(alertController, animated: true, completion: nil)
        }         

    })
  }
}