publishing fails when including mp4 video

Hi - I updated a lesson I originally built with Presenter 09. It contains a screen capture video in mp4 format. When I previewed the lesson the video worked fine. But the lesson won't publish - an error message comes up after a while and the publish menu stays open. I successfully published a separate updated lesson, the difference appears to be the video. How can I get this to publish to LMS? 

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