Fatal error: Uncaught Error: Class 'Symfony\Contracts\EventDispatcher\Event' not found in /mnt/volume_lon1_01/backend/admin/vendor/symfony/console/Event/ConsoleEvent.php:24 Stack trace: #0 {main} thrown in /mnt/volume_lon1_01/backend/admin/vendor/symfony/console/Event/ConsoleEvent.php on line 24