What is the meaning of this error in cakephp 3?

Hello, I am doing the blog tutorial in cakephp 3, but I got this notice at the top of my page, please does anyone know the meaning and how to solve it?

Strict (2048): Declaration of App\Controller\AppController::beforefilter() should be compatible with Cake\Controller\Controller::beforeFilter(Cake\Event\Event $event) [APP/Controller\AppController.php, line 29]



Strict (2048): Declaration of App\Controller\UsersController::beforefilter() should be compatible with App\Controller\AppController::beforefilter() [APP/Controller\UsersController.php, line 10]

Your help will be appreciated

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