Fatal error: Uncaught Error: Class "HTMLPurifier_AttrDef" not found in C:\xampp\htdocs\UP_Distribution\pds_dfpd_up\vendor\ezyang\htmlpurifier\library\HTMLPurifier\AttrDef\CSS\Length.php:6 Stack trace: #0 {main} thrown in C:\xampp\htdocs\UP_Distribution\pds_dfpd_up\vendor\ezyang\htmlpurifier\library\HTMLPurifier\AttrDef\CSS\Length.php on line 6