The DreamHost customer who owns this domain has not paid their hosting bill. It's probably just a glitch with the credit card and something needs to be updated.
If you are the owner of this domain, you'll find your login information contained within the emails sent to you when your account was activated. Once logged in, you'll be able to make a payment to reactivate your site.
The total amount past due is $119.40 (Annual Billing)