Starvetogether.exe not working

@Touhou_Lover Tell your friend to disable all the client and server side mods they have enabled and to verify the integrity of their game files again.

There's a few of them based on the log, but I'm not sure which once may be causing the issue (maybe Craftable Mandrakes?).

Try playing the game again with their mobs disabled and if no issue occurs, try enabling each mod individually to see where the problem lies.