4
It needs a server name for the database server. Probably localhost, if it's on the same machine. Also, make sure that you've entered the right username and password suring the XOOPS install. If it can find and connect to the DB, but can't find the db, it opts to create one for you (if the user you entered is allowed to do so). The error you're getting is that it can't find the database server itself, or connect to it.
Herko