Trouble with new files

[KatFennec]

getting the error

Fatal error: Class 'AppController' not found in /home/katfenne/clikrit.evocrit.com/electricglacier2.php on line 2

on a custom page. code for the page:

PHP Code:

<?php 
class Electricglacier2Controller extends AppController{ 

public function __construct(){ 
parent::__construct("member"); 
} 

public function index(){ 
$mysidia = Registry::get("mysidia"); 
} 

} 
?>

Previously created page, using an identical copy of that code, save for the controller name, worked flawlessly.