Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\Event\KernelEvent" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\http-kernel\Event\ControllerEvent.php:28 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\http-kernel\Event\ControllerEvent.php on line 28