Fatal error: Uncaught Error: Class 'Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag' not found in C:\xampp\htdocs\admin\vendor\symfony\http-foundation\Session\Attribute\NamespacedAttributeBag.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\admin\vendor\symfony\http-foundation\Session\Attribute\NamespacedAttributeBag.php on line 20