SyncToy 2.1 Exception during preview

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  I am using Windows 7 and have been using Microsoft Synctoy for years. Just recently I received the error message when trying to sync between our two laptops and it terminates my syncing procedure. The message follows. Any help on this?
  
  "Exception during preview: The metadata store item could not be saved as it does not have a unique ID (or other primary key).

  Monday, February 4, 2013 5:46 AM