Cannot serve the example application (Windows)

I tried the example in the docs

PS C:\Users\georges\prog> ionic start toto --v2
Downloading: https://github.com/driftyco/ionic2-app-base/archive/master.zip
[=============================] 100% 0.0s
Downloading: https://github.com/driftyco/ionic2-starter-tabs/archive/master.zip
[=============================] 100% 0.0s
Installing Node Modules
Updated the hooks directory to have execute permissions
New! Add push notifications, update your app remotely, and package iOS and Android apps with the Ionic Platform!
https://apps.ionic.io/signup

New to Ionic? Get started here: http://ionicframework.com/docs/v2/getting-started

Then I get

PS C:\Users\georges\prog\toto> ionic serve                                                  
∆ Compiling and bundling with Webpack...                                                    
√ Using your webpack.config.js file: C:\Users\georges\prog\toto\webpack.config.js           
                                                                                    
multi main                                                                                  
Module not found: Error: Cannot resolve 'file' or 'directory' C:\Users\georges\prog\toto\app
orges\prog\toto                                                                             
resolve file                                                                                
  C:\Users\georges\prog\toto\app\app.js doesn't exist                                       
  C:\Users\georges\prog\toto\app\app doesn't exist                                          
resolve directory                                                                           
  C:\Users\georges\prog\toto\app\app doesn't exist (directory default file)                 
  C:\Users\georges\prog\toto\app\app\package.json doesn't exist (directory description file)
[C:\Users\georges\prog\toto\app\app.js]                                                     
[C:\Users\georges\prog\toto\app\app]                                                        
 @ multi main (CLI v2.0.0-alpha.23)                                                         
                                                                                    
Your system information:                                                                    
                                                                                    
Cordova CLI: 5.3.3                                                                          
Gulp version:  CLI version 3.9.0                                                            
Gulp local:   Local version 3.9.0                                                           
Ionic Version: 2.0.0-alpha.47                                                               
Ionic CLI Version: 2.0.0-alpha.23                                                           
Ionic App Lib Version: 2.0.0-alpha.22                                                       
OS:                                                                                         
Node Version: v4.1.2                                                                                                                                                            

What is the problem ??

The latest CLI version that works with Ionic 2 is 2.0.0-beta.15, please update to this version by running the following:

npm install -g ionic@beta

Then you will want to start a new project.

Here are the docs on this: http://ionicframework.com/docs/v2/getting-started/installation/