Fatal error: Uncaught Error: Class 'HTMLPurifier_ChildDef_Required' not found in /home/edmedu/www/edmclass.com.bak/edmclass-admin/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Optional.php:10 Stack trace: #0 {main} thrown in /home/edmedu/www/edmclass.com.bak/edmclass-admin/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Optional.php on line 10