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