Fatal error: Uncaught Error: Class "HTMLPurifier_HTMLModule" not found in /srv/www/htdocs/moodle/lib/htmlpurifier/HTMLPurifier/HTMLModule/Legacy.php:19 Stack trace: #0 {main} thrown in /srv/www/htdocs/moodle/lib/htmlpurifier/HTMLPurifier/HTMLModule/Legacy.php on line 19