Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /home/flighto/e-commerce/vendor/sylius-labs/polyfill-symfony-event-dispatcher/src/Event.php:15 Stack trace: #0 {main} thrown in /home/flighto/e-commerce/vendor/sylius-labs/polyfill-symfony-event-dispatcher/src/Event.php on line 15