You can also try to uncheck “Add Leaf Bones” in fbx export options. Maybe these bones with “_end” endings are just extra bones added by this option, so they’re not weighted, hence the error… Just a blind guess.
You can also try to uncheck “Add Leaf Bones” in fbx export options. Maybe these bones with “_end” endings are just extra bones added by this option, so they’re not weighted, hence the error… Just a blind guess.