sadly this is unfixable, we have tried a lot but nothing works, it happens when you use to many mod items on an Oc, try taking off a few and it should be good!
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ohhh probably make sure your not working alone and that if you have a team a coder is the 1st thing you find, I worked on the mod along and it took ages so finding people to work on it with is a lot better, Iv also seen mods in the making waiting for months as they have too many artists and no coders so finding one first should hell :D
Overall make sure you don’t put it before your health or anything though, it could take a while but that’s not a bad thing, just gotta make sure it’s not your first priority :]