debug.log
1.20.1-1.4.4~1.3.10Will cause a crash，I didn't test the rest of the versions

I don't have enough information to identify the problem, here's what I got:

• This is likely not a Lithostitched issue, the error points at the issue happening without Lithostitched as well.
• The errors blame a mod with the sawmillhouse mod id. I tried checking the sawmill mod you have installed but couldn't find any issues with it.

You'll likely have to remove mods until the crashing stops to identify the problem mod.

I was able to create worlds when I disabled the Lithostitched

The mod list still doesn't provide enough information on what mod is conflicting with Lithostitched. You'll need to remove mods until you find the one that conflicts.