Missing Controller

Error: Robots.txtController could not be found.

Error: Create the class Robots.txtController below in file: dt_app/controllers/robots.txt_controller.php

<?php
class Robots.txtController extends AppController {

	var $name = 'Robots.txt';
}
?>

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