Error when activating a custom plugin on production server

Question

Thanks to @the_hobbes and @Charles, I realized that the file Activate.php was not incorporated. By adding require_once plugin_dir_path( __FILE__ ) . 'inc/Base/Activate.php'; to my code as shown below, it works correctly:

function activate_adstoolbox_plugin() {
    require_once plugin_dir_path( __FILE__ ) . 'inc/Base/Activate.php';
    Inc\Base\Activate::activate();
}
register_activation_hook( __FILE__, 'activate_adstoolbox_plugin' );

Oops! Newbie’s error …