Fatal error: Uncaught Error: Call to undefined function add_filter() in C:\xampp\htdocs\wp-content\plugins\members\addons\members-role-hierarchy\inc\functions-filters.php:13 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-content\plugins\members\addons\members-role-hierarchy\inc\functions-filters.php on line 13