Missing Controller

Error: Concentrationd9Controller could not be found.

Error: Create the class Concentrationd9Controller below in file: app/controllers/concentrationd9_controller.php

<?php
class Concentrationd9Controller extends AppController {

	var $name = 'Concentrationd9';
}
?>

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