Missing Method in GalleriesController

Error: The action cat:15 is not defined in controller GalleriesController

Error: Create GalleriesController::cat:15() in file: app/controllers/galleries_controller.php.

<?php
class GalleriesController extends AppController {

	var $name = 'Galleries';


	function cat:15() {

	}

}
?>

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