Fatal error: Uncaught Error: Class 'Symfony\Contracts\EventDispatcher\Event' not found in C:\Apache24\htdocs\cwbts\vendor\symfony\security-http\Event\SwitchUserEvent.php:24 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cwbts\vendor\symfony\security-http\Event\SwitchUserEvent.php on line 24