"Problem loading; Server Not Found:

I am using prosites and created the subdomain oneheart.unitedundergod.org. It has been about an hour since this site was created and the site will not show up.
I have tried typing in the url and accessing it through the admin dashboard but it will not display. Do you know what the problem could be?
FYI - I recently started using A2 hosting which I have had a lot of problems with so far. Do you know of any problems/ conflicts using WPMU with A2?

Thanks for your help.