Photoshop won't let me convert video frames to layers

I'm trying to make gifs, and I was able to do this last night. Photoshop was converting the video frames to layers just fine. However, I think I might have accidentally done something to photoshop because right after, I could convert my video frames to layers anymore. The video clips were all screen recording from quicktime, by the way. I waited until the next day and decided to see if it would work (it didn't). So then I did a software update, thinking that maybe quicktime needed to update. But that didn't work either. When I force quit photoshop and re-open it, it "converts" the video frames to layer, but only one frame actually appears and the rest are blank. When I delete that and try to re-convert the video frames to layers, this pops up:

I tried converting the video to an mp4, and the above message still popped up. How do I fix this back to the way it was when it was working!?