Error message iTunes was unable to load data class information from Sync Services

I purchased some songs to download to my ipod and keep getting the following message: iTunes was unable to load data class information from Sync Services.
The songs have transferred okay to my ipad and iphone with no issue.
ipod has sw update 6.1.6.
Have tried the various suggestions regarding this issue on the site, but without success.
Are there any other suggestions?
I am using Windows 7.
I see from a google search that this is a common problem so why hasn't it been rectified in bug fixes?

Hello Human1234,
Thanks for using Apple Support Communities.
To troubleshoot Sync Services with Outlook and iTunes, please follow the troubleshooting in the article below.
Troubleshooting Sync Services on Windows with Microsoft Outlook 2003, Outlook 2007, or Outlook 2010
http://support.apple.com/kb/TS2776
Take care,
Alex H.

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Thanks for visiting Apple Support Communities.
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http://support.apple.com/kb/TS2690
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If not successful see the previous discussion on the right side of this page with the green checkmark.

Error message iTunes was unable to load data class information from Sync Services

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