Fatal error: Uncaught Error: Call to undefined function add_action() in /opt/app-root/src/wp-content/plugins/advanced-custom-fields/includes/forms/form-attachment.php:33 Stack trace: #0 /opt/app-root/src/wp-content/plugins/advanced-custom-fields/includes/forms/form-attachment.php(239): acf_form_attachment->__construct() #1 {main} thrown in /opt/app-root/src/wp-content/plugins/advanced-custom-fields/includes/forms/form-attachment.php on line 33