Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/marshalltowncsd/sites/marshalltown.k12.ia.us/releases/20230829083101/web/app/plugins/advanced-custom-fields-pro/includes/acf-input-functions.php:103 Stack trace: #0 {main} thrown in /home/marshalltowncsd/sites/marshalltown.k12.ia.us/releases/20230829083101/web/app/plugins/advanced-custom-fields-pro/includes/acf-input-functions.php on line 103