Fatal error: Uncaught Error: Interface 'Symfony\Component\EventDispatcher\EventSubscriberInterface' not found in /mnt/volume_lon1_01/backend/admin/vendor/symfony/http-kernel/EventListener/AbstractTestSessionListener.php:32 Stack trace: #0 {main} thrown in /mnt/volume_lon1_01/backend/admin/vendor/symfony/http-kernel/EventListener/AbstractTestSessionListener.php on line 32