Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\Event\RequestEvent" not found in C:\xampp\htdocs\adminlte3\vendor\symfony\http-kernel\Event 2\ExceptionEvent.php:30 Stack trace: #0 {main} thrown in C:\xampp\htdocs\adminlte3\vendor\symfony\http-kernel\Event 2\ExceptionEvent.php on line 30