Fatal error: Uncaught Error: Class "Symfony\Component\Config\Loader\FileLoader" not found in C:\xampp\htdocs\my-app\my-new-app\vendor\symfony\routing\Loader\PhpFileLoader.php:28 Stack trace: #0 {main} thrown in C:\xampp\htdocs\my-app\my-new-app\vendor\symfony\routing\Loader\PhpFileLoader.php on line 28