So at my website
http://jsgaming.info/ I get this error:
I only installed MyBB yesterday and am using the newest version. My webhost is BeastNode.
Contact your webhost. That error isn't produced by MyBB.
When I click the link all I see is a page offering to let me buy the domain. My guess is the DNS hasn't propagated fully yet.
I think I forgot to mention that it was working fine yesterday.
Never mind was a name server issue by godaddy.
There's definitely something wrong with the DNS. You could try contacting your host as Nathan said, but the error's certainly not being caused by MyBB.