Missing Controller

Error: Si2120.htmlController could not be found.

Error: Create the class Si2120.htmlController below in file: app/controllers/si2120.html_controller.php

<?php
class Si2120.htmlController extends AppController {

	var $name = 'Si2120.html';
}
?>

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