Black screen with exclamation mark .

Using iphoto 11 ver 9.2.1.
When I click on a photo to open the file I get a black screen with an exclamation mark.
I have tried rebuiding database from automatic backups and all the others listed when opening iphoto with the alt+command key held down. I have also d/l the iphoto manager as suggeste in other posts but I am told this does not work with my installation.
Help please.

Thanks for your reply. I triedrunning Library Manager again and it worked this time.
However I got the message : 83 photos were successfully copied.
                                            33 photos could not be copied because they could not be found in the original                                                           library.
Unfortunatly they were the photos I wanted & somewhere along the line I have lost my backupo of them.

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