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Jul 7, 2013 8:35 AM in response to mrsmarlesby rkaufmann87,It means what it said, that you have to restore from your back-up. I hope you have been backing up, if not well I hate to say it but you might be about to learn a very painful lesson on why backing up your computer is something that is critical, not something that should be done but something that must be done.
You can try to fix your library though, Apple explains how in Rebuilding the iPhoto library