I got two different errors while setting up my RAF team recently, one of the errors I still have so I called blizzard and they said to go to a store and buy the game instead. Thats a little beside the point but it would help if you said what error specifically you were getting. I believe there are a few threads about it on the forums already but I assume you're getting the error bah screw it cbf typing much at 2:41am. I gotta get up for work in 4 hours so my suggestion would be if you use a router and your ISP uses dynamic ip addresses, reset your router and hopefully you should get a new IP address (I did and it worked fine) anyways I'm out.