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Lightroom Exporting Error. Unable to export. Help!

I am trying to export client photos from Lightroom 3 (the same way I always do) to a hard drive and it is giving me this error message:

Unable to Export:
An internal error has occurred: ?:0: attempt to index field '_dataChanges' (a nil value)

I've never had this happen before and the job is at a standstill until I can get this worked out.

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