Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in C:\Apache24_x64\htdocs\origin_cms8\vendor\symfony\event-dispatcher\GenericEvent.php:26 Stack trace: #0 {main} thrown in C:\Apache24_x64\htdocs\origin_cms8\vendor\symfony\event-dispatcher\GenericEvent.php on line 26