Fatal error: Uncaught Error: Class 'Symfony\Component\HttpFoundation\ParameterBag' not found in D:\xampp\htdocs\psp\backend\vendor\symfony\http-foundation\InputBag.php:21 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\symfony\http-foundation\InputBag.php on line 21