Fatal error: Uncaught Error: Class "HTMLPurifier_AttrDef" not found in /var/www/html/includes/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/LinkTypes.php:9 Stack trace: #0 {main} thrown in /var/www/html/includes/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/LinkTypes.php on line 9