So I download Lineage2 and go to make my account

I went to fileplanet earlier today and seen that members can get into Lineage 2 closed beta...So im all physced and I DL it, then get my account key...Go to setup this account at this website for the game, make the account fine. Then go to add the game, and when i put in the CD key, it says its already in use ...... this is teh suc, any ideas on what to do ? Im just sittin here stareing at the login screen of the game