Originally posted by DirtySyX:

A not working mod. disable one by one to find out what the non working mod is.

You can either try to use the last game version or you need to look for a other mod. very dependend on the mod. sadly most of the mods dont get updates anymore, so on a Game update like mistlands a lot of mods will stop working or need someone to update them.

We still dont use the latest game version because from our 18 mods we play with, only 2 have updates for the latest version

How do you change version of valheim? I could only see one option under the beta tab