When I install this mod and cloth config 8.3.103 into my modpack where several other mods are using cloth config I get this message:

If I remove or add older cloth config version I get this message:

If I remove Better Totem of Undying or Forgotten Graves I get no error and the game loads. Not sure which mod is causing the issue.

I think that forgotten graves has a version 3.2.2 and you are using 3.2.1. Please try using the 3.2.2 version and see if it works. Looking at his code and also my code, there is nothing wrong.

Yeah, It was a problem with Forgotten Graves, I posted this issue to their tracker too and they fixed it in 3.2.2. Really fast too. So im closing this now.