php - CakePHP -Call to a member function allow() on null

one text

When I enter the user registration information and click the Register button then I have an error on this line in this function.

$this->Auth->allow(['register', 'login', 'logout', 'verification']);

Userscontroller.php

class UsersController extends AppController
{
    public function beforeFilter(EventInterface $event)
    {
        parent::beforeFilter($event);
        // Allow users to register and logout.
        // You should not add the "login" action to allow list. Doing so would
        // cause problems with normal functioning of AuthComponent.
        $this->Auth->allow(['register', 'login', 'logout', 'verification']);
        $this->viewBuilder()->setLayout('products');
    }
// ...
}