CHAPTER 12: WEB Application: No Preview (webtools not working??)

Hello,

I am having problem with implementation of chapter 12. No models are being displayed once the submit button is clicked.

I have tried to debug the problem and found that none of the webtools api is working:
> > "http://cdn.robotwebtools.org/"   It is not working. hence all js files are failed to load.

Is there a way across it??

Many Thanks.
