Video shows up in editing but not in preview

Hi, 

I inserted various video clips and all of them are showing up when I go to preview the project except 1. They were all recorded at the same time, have the same settings, and I've tried to delete it and re-insert it, but no luck. 

It won't play when I click on it in editing nor will it show up when I preview the slide. 

Help! 

-Alex

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