Missing Method in ResourcesController

Error: The action list_by_category is not defined in controller ResourcesController

Error: Create ResourcesController::list_by_category() in file: app/controllers/resources_controller.php.

<?php
class ResourcesController extends AppController {

	var $name = 'Resources';


	function list_by_category() {

	}

}
?>

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