I was creating NPCs fine and then suddenly I'm getting "Not a valid NPC" after making more, I've tried several ones exactly like I was doing before that worked. They show in the NPC list and can edit them if I type their ID number in but not when looking at them. 

The Quest mod also says they are not a valid NPC

you got to be closer when looking at them and try looking at there bellys maybye its touchy..