I'm trying to create a family for a mod, with a Khajiit maid, however when I place the Khajiit NPC in the cell I get warnings that several nif files are missing and a weird thing happens with her tail where it is stretched all over the place, this even shows up in game! also I am unable to move the npc from the point at which I dragged her into the cell.

The warning comes up: Bone 'Bip01 Tail01' not found for part 'BASE Characters\Khajiit\KhajiitTail.NIF' And it does the same for 'Bip01 Tail02' down to 'Bip01 Tail08'

Do I need to find these files somewhere and manually download them and put them in the right place?