Fatal error: Uncaught Error: Call to undefined function add_action() in /home2/cp299447/public_html/watthumpla.ac.th/wp-admin/includes/admin-filters.php:11
Stack trace:
#0 {main}
thrown in /home2/cp299447/public_html/watthumpla.ac.th/wp-admin/includes/admin-filters.php on line 11