Fatal error: Uncaught Error: Class 'Symfony\Contracts\EventDispatcher\Event' not found in E:\xampp\htdocs\www\order\qr250\vendor\symfony\mailer\Event\MessageEvent.php:23 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\order\qr250\vendor\symfony\mailer\Event\MessageEvent.php on line 23