Issue with clustered setup

[nessa421]

I'm trying to set up a webserver connecting remotely to a MySQL server, set up according to the documentation. After installing Sitebuilder I tried to run the config and it's giving this error (ip and pass info removed):

[root@server ~]# sb_config --db_host <ip> --db_admin_passwd <pass> sb_db_user_passwd <pass>
Updating Sitebuilder database user credentials
[ERROR] DB error: Duplicate entry 'localhost-sitebuilder3-sitebuilder_db' for key 1
[FATAL] Cannot update Sitebuilder database user
There were some configuration errors, check logs
Logs saved to /usr/local/sitebuilder/tmp/sb_config-1002231620.log

All that is on the MySQL server is MySQL with the root and sitebuilder_db users created with super privileges. Any idea what the problem is?