Missing Controller

Error: Ipref12 could not be found.

Error: Create the class Ipref12 below in file: app_dental/controllers/ipref12.php

<?php
class Ipref12 extends AppController {

	var $name = 'Ipref12';
}
?>

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