Dark face bug on custom follower mods.

[clouds23443]

I have been having this problem for a while and I cannot seem to figure out how to solve it. I am trying to change certain head parts of cutsom npc mods like toccata, temptress race etc. When I export the facetints with ctrl+f4 I get multiple errors saying CK cannot find kshairs and other types of assets. I am assuming that these are the headparts the mod author used to make the npc. Crtl+f4 works perfectly on vanilla npcs, or any others that dont use custom assets. Do I need to track down all of the custom headparts like kshairs in order for the custom npcs to export correctly? I hope that isnt the case as that would mean users have to basically find every part an author used when they want to edit a custom npc?