Ricky & Jim are experiencing ... I did try clicking on to the http link that you provided ... which took a long time to load and this is the default message I received. Hope it helps you to diagnose the problem.

Server Default page

If you see this page it means:
1. hosting for this domain is not configured
or
2. there's no such domain registered in Plesk

What you can do:

Using Plesk, you can create domains with web hosting on a single physical server.