Add-AzureNodeWebRole

I try to go over the tutorial/presentation at http://learnwindowsazure.sourceforge.net/, and I cannot reproduce the steps related to node.

When I run Add-AzureNodeWebRole command I get Add-AzureNodeWebRole : service root is invalid or empty

Also when running the previous command, New-AzureService", there aren't any files created in the folder.

What would this exactly mean?

you need to run the cmdlet New-AzureServiceProject not New-AzureService.