Fatal error: Uncaught Error: Class 'HTMLPurifier_AttrDef' not found in D:\xampp\htdocs\datatext_v4\vendor\ezyang\htmlpurifier\library\HTMLPurifier\AttrDef\CSS\Background.php:7 Stack trace: #0 {main} thrown in D:\xampp\htdocs\datatext_v4\vendor\ezyang\htmlpurifier\library\HTMLPurifier\AttrDef\CSS\Background.php on line 7