Minecraft Fabric 1.16.5

Well, I really don't know how to fix it, because there are no mods with "this" name in my mods folder. I can add screenshots with mods from my mods folder. I have tried to find the answer many times :\

You're using a mod that has the Satin mod inside of it.

Here's a list of all mods on CurseForge that use Satin. If you have any of them in your mods folder, you have to remove them to use OptiFine shaders.