Missing Controller

Error: A0057.htmlController could not be found.

Error: Create the class A0057.htmlController below in file: sgk-net.co.jp/controllers/a0057.html_controller.php

<?php
class A0057.htmlController extends AppController {

	var $name = 'A0057.html';
}
?>

Notice: If you want to customize this error message, create sgk-net.co.jp/views/errors/missing_controller.ctp