Fatal error: Uncaught Error: Class "Symfony\Component\EventDispatcher\GenericEvent" not found in /home/flighto/e-commerce/vendor/sylius/resource-bundle/src/Bundle/Event/ResourceControllerEvent.php:19 Stack trace: #0 {main} thrown in /home/flighto/e-commerce/vendor/sylius/resource-bundle/src/Bundle/Event/ResourceControllerEvent.php on line 19