Minecraft v1.16.5
Forge v36.0.7
Big Brain v1.1.1

My server crashed during world load after adding this mod.
Crash Report

Was this published in the hotfix? I got the crash again.
https://gist.github.com/WenXin20/e09bc767ac41135517ae04d8c1893098

Redownload the mod again and see if it still crashes.

EDIT : I seem to have forgot to delete the other instance of the "non existent method", I will fix that next morning, for now, disable that behavior in the config.