I'm getting the same error. I'm using Mods but they've always worked until today. I've tried activating it from different places and its always the same
I got the same error, but not just with toybox. I had to remove a camera fov mod (which toybox also has an option for). the new trainer version has a fov option incorperated, which is great but I need toybox for some quest related things.
Good news is that previous version of the trainer still works so I can still use that +mods