Fatal error: Uncaught Error: Class 'Symfony\Contracts\EventDispatcher\Event' not found in D:\workspaces\liZiPingBack\vendor\symfony\security-http\Event\DeauthenticatedEvent.php:24 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\security-http\Event\DeauthenticatedEvent.php on line 24