Fatal error: Uncaught Error: Class 'HTMLPurifier_Strategy' not found in /home/aefn/public_html/moodle/lib/htmlpurifier/HTMLPurifier/Strategy/RemoveForeignElements.php:11 Stack trace: #0 {main} thrown in /home/aefn/public_html/moodle/lib/htmlpurifier/HTMLPurifier/Strategy/RemoveForeignElements.php on line 11