Fatal error: Uncaught Error: Class 'HTMLPurifier_AttrTransform' not found in /var/www/app/appregwebservice/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/SafeParam.php:15 Stack trace: #0 {main} thrown in /var/www/app/appregwebservice/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrTransform/SafeParam.php on line 15