Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\Event' not found in D:\workspaces\liZiPingBack\vendor\symfony\security-core\Event\AuthenticationEvent.php:22 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\security-core\Event\AuthenticationEvent.php on line 22