Game freezes and i get backend error when doing anything

The game freezes either if i try to upgrade the workbench, move items, delete items, sell items. It doesn't really seem to matter what i do.
I tried new accounts. reinstall of the server. I tried without the (except the "fix" mods).

Yhea, but the thing is that it's already in the mod's list. Do i need to enable it or something

Can do. Tried it again now without any mods installed. As soon as i move anything or try to use anything i get the same error.