Missing Controller

Error: ConcreteExpanded.htmlController could not be found.

Error: Create the class ConcreteExpanded.htmlController below in file: app/controllers/concrete_expanded.html_controller.php

<?php
class ConcreteExpanded.htmlController extends AppController {

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

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