KeyNotFoundException: Unable to locate parent from child

[Chadddwickd]

I've been following the whole tutorial properly but when I get to the conversion I keep getting this error. I could possibly be doing something wrong but I'm unsure. Am I missing a step? (Still pretty new to Unity)

[AdalynBlack]

The LipsyncToAnim script needs to be parented to the avatar, and the mouth object needs to be a child of the object that script is on. I should probably make the error more descriptive lol