Fatal error: Uncaught Error: Class "HTMLPurifier_AttrDef" not found in D:\xampp\htdocs\_runing\sales-manager-system\vendor\ezyang\htmlpurifier\library\HTMLPurifier\AttrDef\HTML\Pixels.php:6 Stack trace: #0 {main} thrown in D:\xampp\htdocs\_runing\sales-manager-system\vendor\ezyang\htmlpurifier\library\HTMLPurifier\AttrDef\HTML\Pixels.php on line 6