Fatal error: Uncaught Error: Class 'HTMLPurifier_AttrDef' not found in C:\Apache24\htdocs\cwlms\vendor\ezyang\htmlpurifier\library\HTMLPurifier\AttrDef\CSS\Composite.php:12 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cwlms\vendor\ezyang\htmlpurifier\library\HTMLPurifier\AttrDef\CSS\Composite.php on line 12