Fatal error: Uncaught Error: Class "Symfony\Component\Config\Loader\Loader" not found in C:\xampp\htdocs\my-app\my-new-app\vendor\symfony\routing\Loader\ClosureLoader.php:24 Stack trace: #0 {main} thrown in C:\xampp\htdocs\my-app\my-new-app\vendor\symfony\routing\Loader\ClosureLoader.php on line 24