Fatal error: Uncaught Error: Class "HTMLPurifier_ChildDef_Required" not found in D:\xampp\htdocs\_runing\sales-manager-system\vendor\ezyang\htmlpurifier\library\HTMLPurifier\ChildDef\Optional.php:10 Stack trace: #0 {main} thrown in D:\xampp\htdocs\_runing\sales-manager-system\vendor\ezyang\htmlpurifier\library\HTMLPurifier\ChildDef\Optional.php on line 10