Environment for Minecraft 1.12 branch won't work correctly

[TvL2386]

Hi devs!

This might be an issue, but it's probably my own incompetence.

I want to start developing for ArchitectureCraft on MC 1.12.2. I have a feature I'd like to add.

So I forked the repo, checked out the 1.12 branch and configured my git/eclipse/jdk.
After running the runClient task everything seems to go fine. Minecraft starts, but when I generate a new world it ends with minecraft shutting down and seeing the latest.log complain about missing variants.
Crash report: https://gist.github.com/TvL2386/07ddc8122875625b58f8f09aa5431f7e

I'm not sure if there is something wrong with the state of the current repo or if I'm doing something dumb.
I'd greatly appreciate it if you could tell me what's going wrong.

• Minecraft version: 1.12.2
• Forge version: 14.23.4.2747
• ArchitectureCraft version: 1.2.0.6
  See the crash report for more details.

Kind regards,
TvL2386

[TvL2386]

I think it has to do with JEI. Commented it as a dependency in project.gradle and now it starts the world fine