Fatal error: Uncaught Error: Class "HTMLPurifier_Node" not found in /srv/www/htdocs/moodle/lib/htmlpurifier/HTMLPurifier/Node/Comment.php:6 Stack trace: #0 {main} thrown in /srv/www/htdocs/moodle/lib/htmlpurifier/HTMLPurifier/Node/Comment.php on line 6