Fatal error: Uncaught Error: Call to undefined function add_action() in /data/d/b/db99ac3c-5fdf-4d24-886b-cfc9205a6c40/pingdev.eu/web/wp-content/plugins/hello.php:69 Stack trace: #0 {main} thrown in /data/d/b/db99ac3c-5fdf-4d24-886b-cfc9205a6c40/pingdev.eu/web/wp-content/plugins/hello.php on line 69