I get 'unknown error' message when I try to sign in to Air app store (I can sign in to iTunes just fine). Anyone help

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When I try to sign in to the Air app store, I get an 'unknown error' message.  I can sign in to iTunes just fine.  Any suggestions?
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Replay

Fixed the problem by going to settings/store and logging out with apple ID.  Then logged back in with password and updates, apps, and iTunes store seem to work ok now.