Gamestop Keys don't work for servers?

[faded 13]

I bought ArmA2 and the expansion Operation Arrowhead and I have everything updated and I try to launch from Sixlauncher but when I try to join a server I get this message.

What keys do I install?

Edited July 13, 2012 by Fade

[Lith 80]

Try copying the addons folder from root Arma2 to Arma2 OA root folder.