Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\Event' not found in D:\svn\epic-site(사전예약)\default\vendor\symfony\http-kernel\Event\KernelEvent.php:23 Stack trace: #0 {main} thrown in D:\svn\epic-site(사전예약)\default\vendor\symfony\http-kernel\Event\KernelEvent.php on line 23