Fatal error: Uncaught Error: Class "HTMLPurifier_TagTransform" not found in /srv/www/htdocs/moodle/lib/htmlpurifier/HTMLPurifier/TagTransform/Simple.php:8 Stack trace: #0 {main} thrown in /srv/www/htdocs/moodle/lib/htmlpurifier/HTMLPurifier/TagTransform/Simple.php on line 8