Fatal error: Uncaught Error: Class 'Symfony\Component\Config\Loader\FileLoader' not found in D:\xampp\htdocs\psp\backend\vendor\symfony\routing\Loader\PhpFileLoader.php:28 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\symfony\routing\Loader\PhpFileLoader.php on line 28