Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher' not found in /mnt/volume_lon1_01/backend/admin/vendor/symfony/http-kernel/Debug/TraceableEventDispatcher.php:24 Stack trace: #0 {main} thrown in /mnt/volume_lon1_01/backend/admin/vendor/symfony/http-kernel/Debug/TraceableEventDispatcher.php on line 24