IPhoto video problems when upgraded to Lion

Hi,
I just recently upgraded my MacBook Air (10.7.3) to Lion and I now have trouble with some of the movies that were in my iPhoto library, they can no longer be opened and I get the error message of "A necessary data referrence could not be resolved." The file info indicates that it is a movie mpg file, but it just won't open or play.
Does anyone know what I need to do to "recover" the mpg files so they can play in iPhoto?
Cheers,
Skip

Thanks Terence,
Unfortunately it did not solve the problem. It should be the file where the jgp files are but not the movie. In iPhoto, the file info show it as a video with a size of 10.2 MB, but it will not play.  I can not find this file anywhere other than as a jpg. It is almost as if when I upgraded, the mpg files were converted to jpg but still referrencing in iPhoto as mpg. Any other suggestions?
Cheers,
Skip

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