Missing Method in BookingController

You are seeing this error because the action sign_up is not defined in controller BookingController

If you want to customize this error message, create app/views/errors/missing_action.thtml.

Fatal: Confirm you have created the BookingController::sign_up() in file : app/controllers/booking_controller.php

<?php
class BookingController extends AppController {
   function sign_up() {
   }
}
?>