Hey! I still don't have a solution to this. The facetracking uses OpenSeeFace as a back end and then grabs webcams using built-in Unity functions. I've tried to reorder my code execution and added refresh buttons and such in the past. Most people have this issue clear up on its own with no real reason why. But you can try resetting your PC, try plugging your webcam into a different USB port, or try unplugging other random USB devices and then running vtuber kit. Someone said that fixed it for them once. I'm releasing a new version tomorrow which may help fix any issues, but I kinda doubt it since none of the facetracking code has changed. Sorry I don't have a good answer on this