if I assign Race = Serpentfolk (Degenerate)
then Create Monster
there is no Kit for Serpentfolk (Default)
there is a Kit for Serpentfolk, but it's inaccessible (and different?) for the Degenerates....
Pathfinder core rulebooks (set)
the new kit is presumably copied from the non-degenerate Serpentfolk, and hence tries to add 5 Ranks to 8 skills, so puts up an error dialog!
Normal Serpentfolk have Int 18; Degenerate Serpentfolk have Int 4, and so only get 1SP per HD.
Paizo haven't resolved that
I'd suggest 1 rank in each of Acrobatics, Disguise, Escape Artist, Perception, Sense Motive
(drop Knowledge Arcana, Spellcraft and Use Magic Device and keep the basics. Also they swap racial bonus +4 from UMD to Perception)