Fatal error: Uncaught Error: Class "HTMLPurifier_AttrTransform" not found in E:\xampp\htdocs\stms\vendor\ezyang\htmlpurifier\library\HTMLPurifier\AttrTransform\TargetBlank.php:10 Stack trace: #0 {main} thrown in E:\xampp\htdocs\stms\vendor\ezyang\htmlpurifier\library\HTMLPurifier\AttrTransform\TargetBlank.php on line 10