fully qualified domain name of the host is not found.
Just some guesses here, not an expert. But If my recollection on my one install, The Host is the database that holds the objects. So wouldn't that mean that it couldn't connect to that database. Maybe the listener isn't running, the sysdba user/password wasn't correct.
My other guess is towards the configuration files. Maybe that configuration property isn't in there, or not filled in, or the information in there isn't correct.
Did you install with the wizard? Did you have to do a reinstall? If you did a reinstall that causes issues, mostly because the uninstall does not remove stuff, and therefore your configuration file will have duplicate entries.
Have you tried searching on Oracle's OTN site or on MetaLink?
Good Luck
Mark