Fatal error: Uncaught Error: Class "Symfony\Component\HttpFoundation\HeaderBag" not found in D:\xampp\htdocs\dropifypro\vendor\symfony\http-foundation\ResponseHeaderBag.php:19 Stack trace: #0 {main} thrown in D:\xampp\htdocs\dropifypro\vendor\symfony\http-foundation\ResponseHeaderBag.php on line 19