Class "AppController" not found 📋

Error
Error in: ROOT/src/Controller/SuriwikisController.php, line 3
APP/Controller/SuriwikisController.php at line 3 (edit)
<?php
class SuriwikisController extends AppController {
    public function index() {
        $this->layout 'public';

If you want to customize this error message, create templates/Error/error500.php