Fatal error: Uncaught Error: Call to undefined function register_activation_hook() in C:\xampp\htdocs\vidor.pt\backup\wp-content\plugins\hello-dolly\hello.php:71 Stack trace: #0 C:\xampp\htdocs\vidor.pt\index.php(13): require_once() #1 {main} thrown in C:\xampp\htdocs\vidor.pt\backup\wp-content\plugins\hello-dolly\hello.php on line 71