Minecraft v1.12.2
Forge v14.23.5.2836
NoCubes v0.2.8-Beta 6

It crashes when the game is launched.
Crash Report

Looks like the mod wasn’t properly built, I’ll look into it.

Should be solved by commits f3bfd19 to c22355d.
Download the working version

Release: 1.12.2-0.2.8-pre6-jitpack