Why does it say "An unknown error occured" when logging in?

I on an iMac 8,1 (April 2008).  When I try to log into the app store it says "An unknown error has occured".  I can log into itunes with the same @mac.com account and obviously this forum.

Try signing out of the app (Store menu,) quitting the app, restarting the app and signing back in.

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