Missing Method in UsuariosController

Error: The action filtro is not defined in controller UsuariosController

Error: Create UsuariosController::filtro() in file: app/controllers/usuarios_controller.php.

<?php
class UsuariosController extends AppController {

	var $name = 'Usuarios';


	function filtro() {

	}

}
?>

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