You probably figured it out a long time ago but for anyone else that gets this, i'm pretty sure it will come from incorrectly installing something related to ui. Usually a perk machine. (Maybe always idk fully, it relates to the in game perk icon shaders in the bottom left of the screen, you know what I mean.) I believe it can happen when placing a ui folder included in a download in the wrong place or if it isn't able to read it because you don't have the necessary stuff. You probably don't have l3akmod, which you need to read .lua files for black ops 3. I got this error after incorrectly installing PHD Flopper.