Missing Controller

Error: PortfolioDetailPlain.htmlController could not be found.

Error: Create the class PortfolioDetailPlain.htmlController below in file: app/controllers/portfolio_detail_plain.html_controller.php

<?php
class PortfolioDetailPlain.htmlController extends AppController {

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

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