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This could be an error with iTunes. Please open iTunes. Go to Preferences->Advanced
. Click Reset Warnings
button. Quit iTunes. Open iTunes and see if the error message will come back.
If that does not work, please go to Applications->Utilities->Disk Utility
. Select Disk Aid
. Select your Hard drive and select Repair Permission.
After it is completed, reboot your Mac and test iTunes to see if the error comes back or not.
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