MySQL Hostname Error

I am trying to create a new MySQL database using DreamHost Panel and I always get the following error message for the HOSTNAME:

You’re already using “” for a database (or website).

I have used the same HOSTNAME several times in the past to create new databases and didn’t have that kind of problem.

Anybody knows why I am getting this error message?

Databases using the same hostname must be on the same server. Could that be the problem?