It means your analog_instruments.ini or digital_instruments.ini is referring to an object that doesn't exist.
Also you should not ever be using 3Dsimed for AC to AC modifications, it's only for converting between games. It will do bad stuff to your model. Like messing up object names & properties so they don't work in AC anymore.
this happened to me too,however i used blender and then used ks editor to change it into a kn5 model. i read something else saying blender renames things automatically? (i swapped a steering wheel and added a spoiler on a car)
Blender doesn't allow objects with identical names so it'll automatically change those to unique names. That shouldn't remove any objects that the ini files require though, that's more likely to be from deleting stuff.