Fatal error: Uncaught Error: Class "HTMLPurifier_AttrDef" not found in /var/www/html/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/FontFamily.php:6 Stack trace: #0 {main} thrown in /var/www/html/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/FontFamily.php on line 6