Fatal error: Uncaught Error: Class 'Symfony\Component\HttpFoundation\ParameterBag' not found in /mnt/volume_lon1_01/backend/admin/vendor/symfony/http-foundation/ServerBag.php:21 Stack trace: #0 {main} thrown in /mnt/volume_lon1_01/backend/admin/vendor/symfony/http-foundation/ServerBag.php on line 21