Category talk:Actors

I'm trying to make a new companion NPC from an existing companion mod (which includes both a .esp + .bsa file) but i keep on getting these errors in TES Construction set:

- model load error: in characters\imperial\tail.nif - could not find parent node extra data for 'BASE characters\imperial\tail.nif' - the biped part 'characters\imperial\tail.nif' should be skinned for...etc

Does anybody know what could be the problem? The original mod works perfectly but when i edited the face & race of the NPC in the CS it started coming up with the errors. When i play the game with the edited mod the characters have cross-eyes and lipsync problems. I've seen this problem before but i don't know how to fix it in the construction set. As you can probably tell I'm new at this whole modding thing