Error Registering

This looks like something that keeps popping back up. I have had my copy of GSB for a while. I said, this would be great if you had fleets you could build up, systems to conquer. Well then I saw the Conquest Expansion pack come out. I just purchased the pack. It looks like it requires online presence to work. So I tried the online box, entered the registration code and name I wanted to use. I keep getting this error:

SIM_SERVER: Failed to find reg code when trying to find user name::…\scr\SIM_Server.cpp

Is there another place I need to register my game?

Hmmm. you need to enter the serial code first, get that accepted, then enter a user name, if that helps?