Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\EventListener\AbstractSessionListener' not found in C:\xampp\htdocs\admin\vendor\symfony\http-kernel\EventListener\SessionListener.php:30 Stack trace: #0 {main} thrown in C:\xampp\htdocs\admin\vendor\symfony\http-kernel\EventListener\SessionListener.php on line 30