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