Setrace could not find a matching form (Custom Khajiit female to vampire)

[Blazersama]

Hello everyone!
As you can see from the title my big problem is i using a custom NPC (Kyrenthia khajiit), and i tried to change her first with the Immersive Amazing Follower Tweaks (iAFT), but it cannot do anything. Than i tried with the setrace command (setrace khajiitracevampire) but it doesn't do anything and simply write the setrace error. I tried with vanilla Khajjit npc (Khayla) but is the same problem. I tried to uninstall the "Better Vampires" mod, and check files integrity if it can help but not.
Somebody can help me please? :sad: