Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventDispatcherInterface" not found in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\event-dispatcher\LegacyEventDispatcherProxy.php:25 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\event-dispatcher\LegacyEventDispatcherProxy.php on line 25