how to fix "Fatal error: Unexpectedly found nil while unwrapping an Optional value" in Xcode

how to fix "Fatal error: Unexpectedly found nil while unwrapping an Optional value" in Xcode

 @IBAction func DoneButton(_ sender: Any) {

 @IBAction func DoneButton(_ sender: Any) {


       print("Done Clicked")

       DissmissKeyboard()

       ProgressHUD.show("Registering.....")



       if NameTextField.text != "" && SurnameTextField.text != "" && CountrYTextField.text != "" && CityTextField.text != "" && PhoneTextField.text != "" {


           FUser.registerUserWith(email: Email!, password: Password!, firstName: NameTextField.text!, lastName: SurnameTextField.text!) { (error) in


               if error != nil {

                   ProgressHUD.dismiss()

                   ProgressHUD.showError(error!.localizedDescription)

                   return

               }


               self.RegisterUser()

           }



       } else {

           ProgressHUD.showError("All Fields Are Required..")

       }

   }



Fatal error: Unexpectedly found nil while unwrapping an Optional value

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