"Unknown Error" trying to sign in to iTunes account

I'm unable to sign in using my Apple ID in the iTunes application.  However, I am able to sign in on the web (this forum), the Mac App Store, and also on my iPhone.  Any ideas?

I received this email from Apple and this corrected the problem for me...  I only had to reset the iTunes cache
1) Open iTunes
2) At the top menu, click File > Preferences (iTunes > Preferences on a Mac)
3) In the Preferences menu, click the Advanced tab
4) In the Advanced menu, you should see a button that says "Reset Cache". Please click this button.

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