Error after my Mac goes to sleep after streaming music?

After streaming music and stopping for a while, my Mac goes to sleep and I receive the error in the attached screen shot when I try to stream again. The only thing that seems to work is quitting iTunes an reopening. Why does it do this and how can I stop it from doing this? Thanks.

Hello Media Fred,
It sounds like you are getting this message after the computer wakes from sleep, and you need to restart the iTunes application to get it to work correctly. I recommend signing out of your account first:
Choose Store > Sign In (or Sign Out).
From: iTunes 11 for Mac: Manage your iTunes Store account
http://support.apple.com/kb/PH12299
Then restart your computer, and sign back into the iTunes Store and test the issue.
Thank you for using Apple Support Communities.
Cheers,
Sterling

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Error after my Mac goes to sleep after streaming music?

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