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