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