Fatal error: Uncaught Error: Interface 'Psr\EventDispatcher\StoppableEventInterface' not found in /mnt/volume_lon1_01/backend/adminseppi/vendor/symfony/event-dispatcher-contracts/Event.php:31 Stack trace: #0 {main} thrown in /mnt/volume_lon1_01/backend/adminseppi/vendor/symfony/event-dispatcher-contracts/Event.php on line 31