How to use Skinning properly?

Hi, I am trying to replicate Adam GameObject with the new Skeleton using the Skinning script (https://github.com/sebastianstarke/AI4Animation/issues/8). However, since Adam is a prefab, I am not able to delete the original Adam_Reference like you did:

Here is what I did: Step 1: Attach Skinning to Adam(1) Step 2: Attach Generated Skeleton (from MotionEditor) to Skeleton in Skinning Step 3: press Process button

here is the result:

I tried to rename Adam_reference to be Skeleton and rerun, then an error occurred:

If I unpack the prefab, I am able to delete Adam_reference, however, the skin and skeleton can not work together.

How to solve this problem? Thank you very much