Fatal error: Uncaught Error: Class 'Symfony\Component\Config\Loader\Loader' not found in D:\xampp\htdocs\psp\backend\vendor\symfony\routing\Loader\ObjectLoader.php:23 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\symfony\routing\Loader\ObjectLoader.php on line 23