sql server notification services: Hi,

I am trying to set up the notification services on SQL 2005 by following
http://msdn2.microsoft.com/en-us/library/ms172597.aspx

At step 2, the command: net localgroup users DOMAIN\NSService /add , I got
"There is no such global user or group: ad.vsd.vansd.org\nsservice."

What was I supposed to put in there?
Thank you