Missing Method in NewslettersController

Error: The action ResourceFamilies.pdf is not defined in controller NewslettersController

Error: Create NewslettersController::ResourceFamilies.pdf() in file: /controllers/newsletters_controller.php.

<?php
class NewslettersController extends AppController {

	var $name = 'Newsletters';


	function ResourceFamilies.pdf() {

	}

}
?>

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