Betweenlands version:
3.4.9 (Minecraft 1.12.2)
and I tried 3.3.13

Forge version:
Forge 14.23.5.2838

On Singleplayer but i want to open a server next

Installed mods:
Crash Log has list of all mods.

Link to full crash log
https://paste.dimdev.org/ivifobapuc.rb

It crash on startup

okay it's just that i've too much mod i'll try with NotEnoughIDs and JustEnoughIDs

New crash report : https://paste.dimdev.org/wizaqufono.sql

Duplicate of #772
This is fixed by an official release of ProjectRed, so you need to update that