Fatal error: Uncaught Error: Call to undefined function add_action() in /var/www/andovercg/staging/wp-content/plugins/forminator/samples/forminator-simple-addon-plugin/forminator-simple-addon-plugin.php:19 Stack trace: #0 {main} thrown in /var/www/andovercg/staging/wp-content/plugins/forminator/samples/forminator-simple-addon-plugin/forminator-simple-addon-plugin.php on line 19