Why won't my minecraft world show up?

I was trying to get optifine to work with forge without crashing, and I pulled optifine out of my mods folder. When I went back into the game, my world no longer showed up as an option even though it still shows up in the saves folder. I have completely reset the version and yet it still will not show it, though it still shows my other world.

It's may be a bug. Use Report/Feedback option to report it to the developers.