I have just installed LR on my iMac. I have exported over 33,000 photos from iPhoto to an external hard drive in prep for using them in LR. Along the way I got several messages like the one you're receiving. It was because video files were also being stored in iPhoto and the export had a problem with them. I ignored the message and then made a smart folder for 'Any Photo is Movie' which found all my videos. I exported these using drag and drop.
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