Fatal error: Uncaught Error: Class "Symfony\Component\EventDispatcher\Event" not found in C:\Apache24_x64\htdocs\ipad\vendor\symfony\event-dispatcher\GenericEvent.php:21 Stack trace: #0 {main} thrown in C:\Apache24_x64\htdocs\ipad\vendor\symfony\event-dispatcher\GenericEvent.php on line 21