Extjs MVC folder structure can't load files

I want to use the extjs 4 framework to develop a Web application. It is my first contact with this framework so i started with the tutorials from Sencha. But there is one problem with the mvc tut and i can't find my fault.

At first I have to create following folder structure:

-account_manger
--app
--index.html
--app.js
--controller
---Users.js

But when I start the webside the developer tools from google chrome create this exception:

http://localhost/account_manager/app/app/controller/Users.js?_dc=1334940930898 404 (Not Found)

It seems like he is searching for another folder "app". But i don't now how i can change this. Here is my code from the app.js:

Ext.application({
name: 'AM', appFolder: 'app', controllers: [ 'Users'], ....launch function etc.. });

You should create following structure:

AccountManager
├── index.html
├── app.js
└── app/
    ├── controller/
    │   └── Users.js
    ├── view/
    │   └── Users.js
    ├── model/
    │   ...
    └── store/
        ...