I get this error message when I try to post a picture on Lemmygrad. Any ideas how to solve this?

Error Message: {"data":{"files":null,"msg":"ffprobe Failed with exit status: 1"},"state":"success"}

I use Firefox on PC. I tried turning off add-ons. I've tried through Opera too.

I'm trying to upload memes on DankLeft. I am uploading from my computer.