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/addons/google_classrooms/auditory.php:8 Stack trace: #0 /home/tholic/training.stjohnkenya.org/wp-content/plugins/masterstudy-lms-learning-management-system-pro/addons/google_classrooms/auditory.php(3): STM_LMS_Google_Classroom_Auditory->__construct() #1 {main} thrown in /home/tholic/training.stjohnkenya.org/wp-content/plugins/masterstudy-lms-learning-management-system-pro/addons/google_classrooms/auditory.php on line 8