I just installed most of the user contributed assets, thanks to those few people that make all that stuff like cloth, hair, etc.

I ran into the following problem:
While I can apply "meremaid skin" (maybe because it's not dependend on the standard?), I cannot apply any of the human skinds (asian, caucasian, african). When I select any of these, I get "Cannot get texture from file path data/litspheres/lit_standard_skin.png".
What did I do wrong? Do I have to define that path somewhere myself?