Fatal error: Uncaught Error: Call to undefined function add_action() in /home/imperfettolab/public_html/web/app/mu-plugins/advanced-custom-fields-pro/includes/forms/form-attachment.php:30 Stack trace: #0 /home/imperfettolab/public_html/web/app/mu-plugins/advanced-custom-fields-pro/includes/forms/form-attachment.php(209): acf_form_attachment->__construct() #1 {main} thrown in /home/imperfettolab/public_html/web/app/mu-plugins/advanced-custom-fields-pro/includes/forms/form-attachment.php on line 30