I think that was the issue, but now with the latest update, or at least the second most recent one, there are changes to the mutation categories. It’s looking for threshold_mut regarding the Tortoise mutation.
Error: data/mods//Mutation_Changes/mutation_category.json: line 2:5: member not found: threshold_mut
[
{
^
“type” : “mutation_category”,
“id” : “mutation_tortoise”,
FUNCTION : bool main_menu:new_character_tab()
FILE : src/main_menu.cpp
LINE : 638
Looking at the base mutation_category.json file for the normal data/json directory, there has to be instead of “category” : “TORTOISE”, it should be “threshold_mut” : “THRESH_TORTOISE”, because several mutations are looking for the THRESH_TORTOISE flag such as the grazer mutation. I’ll check and edit this post to see if changing the line of “category” : “TORTOISE” works or not.
edit: found the fix. You need to replace “category” : “TORTOISE” with “threshold_mut” : “THRESH_TORTOISE” and then do the same with the Chimera entry, with it’s “threshold_mut” entry being “THRESH_CHIMERA” and that should allow the game to load. Also, make sure the entry for Chimera’s id is CHIMERA, like Tortoise’s id should be “TORTOISE” since the mutations.json file in the mod folder is still using that for the category. ctrl+f tortoise in the mod’s mutations.json file will show the category being “TORTOISE” and not what the previous entry was. The world loads up with no errors at this point.
