Error when trying to update apps

Whenever I try to update my apps from my macbook I receive the following error.
"*We could not complete your iTunes Store request. An unknown error occurred (400).* There was an error in the iTunes Store. Please try again later."
This has been going on for weeks. I have iTunes 9.0.3 and can download/update apps from my iPhone.

Try testing with an alternate iTunes library.
If the issue only occurs with the primary library, the issue may be related to a specific podcast. Do all of the podcasts play correctly and do the subscriptions update? If there is an issue with a podcast, try removing it from iTunes.
If the issue persists with an alternate iTunes library, try reinstalling iTunes.

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