This error is currently being incorrectly shown for NPCs on the Beta update channel. Update 04/06/2025: Beta is fixed, see below
If you still see this error after 04/06/2025, then you have a script that’s trying to apply invalid clothing variation to a ped.
To help you figure out what is causing it, you can tell what type of clothing by the slotId:
Then you can use any clothing customization menu (vMenu, illenium-appearance, etc) to find the actual article of clothing by the drawblId parameter. So if for example the error is CPed::SetVariation: Invalid variation (slotId: 5, drawblId: 3, texId: 10), then the script is trying to set the 3-rd item in the HAND slot. But it’s trying to use the 10th variant texture of that clothing, which doesn’t exist.