Playback failed error itunes u

"Error - Playback failed".   I get this error on my iPhone 4s  in iTunes u. The phone software is up to date and I have deleted and reinstalled the iTunes app. The courses are listed on my phone, but they will not playback.  I have connectivity to the Internet and can reach the Apple Store.  These same courses will play back on my old iPod.
I have read the discussions, but there seems to be no answer.

Hi 19lynn47,
Welcome to the Support Communities!
The article below may be able to help you with this issue.
Click on the link to see more details and screenshots. 
Can't connect to the iTunes Store
http://support.apple.com/kb/ts1368
Cheers,
- Judy

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