Missing Controller

Error: App2021SController could not be found.

Error: Create the class App2021SController below in file: app/controllers/app2021_s_controller.php

<?php
class App2021SController extends AppController {

	var $name = 'App2021S';
}
?>

Notice: If you want to customize this error message, create app/views/errors/missing_controller.ctp