Fatal error: Uncaught Error: Class "Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag" not found in C:\Apache24\htdocs\cw\vendor\symfony\http-foundation\Session\Attribute\NamespacedAttributeBag.php:20 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cw\vendor\symfony\http-foundation\Session\Attribute\NamespacedAttributeBag.php on line 20