I want to create a modpack for a server. But I cannot create nor load any world (not even superflat).
It puts me right back to main menu.
I couldn't find any solution here or anywhere.

I hope someone can help me with it thank you.

CustomNPCs-latest.log
latest.log

Okay there was a problem with Tinkers mod and those related if you know how to fix that you can explain if not... well i guess I will have to play without Tinkers mods.