In Lightroom Classic I get an error: There was an error working with the video

In the Library, I’m trying to play video in Lightroom Classic with the latest updates. I receive an error saying, “There was an error working with the video”. It does this to all videos. I’ve restarted my computer and closed the program and restarted more than once. If I remove the file from Lightroom then try to import it back it says, “Preview unavailable for this file.” When I click import it says “An unknown error occurred while reading the video file (1).” Some videos in other folders work. In more than one folder they do not play. This problem began after I updated the last Lightroom Classic to 15.5 release.