Fatal error: Uncaught Error: Class 'Symfony\Contracts\EventDispatcher\Event' not found in E:\xampp\htdocs\webhost_v2\vendor\symfony\http-kernel\Event\KernelEvent.php:23 Stack trace: #0 {main} thrown in E:\xampp\htdocs\webhost_v2\vendor\symfony\http-kernel\Event\KernelEvent.php on line 23