Missing Method in SpecialController

Error: The action model is not defined in controller SpecialController

Error: Create SpecialController::model() in file: tanki.arbeit.jp/controllers/special_controller.php.

<?php
class SpecialController extends AppController {

	var $name = 'Special';


	function model() {

	}

}
?>

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