Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/tholic/training.stjohnkenya.org/wp-content/plugins/masterstudy-lms-learning-management-system-pro/includes/hooks/course-player.php:18 Stack trace: #0 {main} thrown in /home/tholic/training.stjohnkenya.org/wp-content/plugins/masterstudy-lms-learning-management-system-pro/includes/hooks/course-player.php on line 18