Missing Method in PublicController

Error: The action signup is not defined in controller PublicController

Error: Create PublicController::signup() in file: app/controllers/public_controller.php.

<?php
class PublicController extends AppController {

	var $name = 'Public';


	function signup() {

	}

}
?>

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