Fatal error: Uncaught Error: Class 'HTMLPurifier_AttrTransform' not found in /home/aefn/public_html/moodle/lib/htmlpurifier/HTMLPurifier/AttrTransform/Lang.php:8 Stack trace: #0 {main} thrown in /home/aefn/public_html/moodle/lib/htmlpurifier/HTMLPurifier/AttrTransform/Lang.php on line 8