AD error - you must login first - missing admin_controller

[billm]

Newbee - if i enter events, calendars, etc i get:
You must be logged in first.
Missing Controller

Error: AdminController could not be found.

Error: Create the class AdminController below in file: app/controllers/admin_controller.php

<?php
class AdminController extends AppController {

        var $name = 'Admin';
}
where is the admin controller or how is it set up?