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