Missing Method in GalleriesController

Error: The action gallery_categories is not defined in controller GalleriesController

Error: Create GalleriesController::gallery_categories() in file: app/controllers/galleries_controller.php.

<?php
class GalleriesController extends AppController {

	var $name = 'Galleries';


	function gallery_categories() {

	}

}
?>

Notice: If you want to customize this error message, create app/views/errors/missing_action.ctp.