Missing Method in PhotoController

Error: The action abstract is not defined in controller PhotoController

Error: Create PhotoController::abstract() in file: app/controllers/photo_controller.php.

<?php
class PhotoController extends AppController {

	var $name = 'Photo';


	function abstract() {

	}

}
?>

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