When trying to sync my I Phone 4 to I tunes I am getting a message: Unable to Data class information from Sync Services. What does this mean?

When I-tunes is trying to sync my phone, I get a message regarding Data Class Information from Sync Services saying they were unable to do this.  I have no idea what this means.  I have not been having any problems with syncing info from my computer to phone until just now.  I am trying to install new alert tones from an app that I purchased.  The alert ones are now in my library on I-tunes and they play but they are not syncing to my phone.  The snycing options is not available in my library and when I try to manually sync these tones, nothing is happening.  I recently purhcased ringtones from the I-tunes store and from my phone and they downloaded with no problems and are synced onto my computer and are showing up in the same library list as the tone alerts which I cannot seem to sync.  I have no idea why this is.  Please help!

In the course of your troubleshooting to date, have you worked through the following document?
iTunes for Windows: "Unable to load data class" or "Unable to load provider data" sync services alert

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