I would guess you have a datapack with mod requirements, unfortunately especially the older ones forget to mention them. you need to get the mods required and then reload datapack
Nope, made this npc myself with no mods installed just to see what happens. Probably just an unexpected error that is unhandled.
oh in that case you just gave them no genitals at all, so ofc it's not gonna work, the game expects there to be something.
