version:Nomifactory (dev branch, 36c19e7)
The first time after install the package it din't crash. But after close it and re-open for the 2nd time it crash.
Here is the crash-report:
crash-2022-01-29_21.13.04-client.txt

Closing since I believe this is fixed already; feel free to reopen if you experience this issue on the latest snapshots.

This is the guides repository. I'm assuming you intended this to go to the pack, so I'll move it.

This issue seems to be a rare problem related to Bansoukou where two versions of the same jar (patched and unpatched) are loaded by Forge at the same time. My suggestion would be to try using the latest snapshot and see if that resolves the issue.

There was a stretch of several snapshots where things were unstable but I believe we have that all sorted out now.