Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\Event\FilterControllerArgumentsEvent" not found in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\http-kernel\Event\ControllerArgumentsEvent.php:28 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\http-kernel\Event\ControllerArgumentsEvent.php on line 28