Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\http-kernel\EventListener\AbstractSessionListener.php:38 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\http-kernel\EventListener\AbstractSessionListener.php on line 38