This error means that script is trying to access a blendshape index that doesn’t exist on your character model, which is required for LipSync to function properly.
Have you made any changes to character model or script? Also, could you let us know which version of the Convai SDK you’re currently using? This will help us guide you more accurately.
Thanks for the update. I’ve tested it on my end but couldn’t reproduce the issue. Could you please try reimporting the Convai SDK?
Also, since you’re using a beta version of Unity, I recommend testing the setup on an LTS (Long-Term Support) version instead, as beta versions can introduce unexpected behavior.