Photo Booth "This document could not be opened"

Hello, I have this issue. I've recorded an important video for my youtube channel about OCD on Photo booth. I recorded two of them right after each other. One of them works, as usual, you can open it up, upload it on youtube, etc. The other however was not being shown in Photo booth library. After some search I've found it as a .mov file. This file however has (unlike other movies from PB) no thumbnail and when I try to open it it gives me a message that says "This document could not be opened".

How to possibly fix this?