Blendshape Transfer error

I’ve got troubles making blendshapes. I do mesh fitting, then post wrap. It works ok. But then when I click on ‘Blendshape Transfer’ button it causes an error:
2022-05-12 07:41:25 [Warning] [omni.usd] Warning: in _ReportErrors at line 2830 of E:\w\ca6c508eae419cf8\USD\pxr\usd\usd\stage.cpp – The relationship target </Materials/mat_skin> from </valera_head.material:binding> in layer @D:_Leo\Valera\Valera_head\Valera_head.usd@ refers to a path outside the scope of the reference from </World/Valera_head>. Ignoring. (getting targets for relationship </World/Valera_head.material:binding> on stage @D:_Leo\Valera\Valera_head\Valera_head_test.usd@ <00000165CF8A1810>)
Valera_head_test.usd (18.3 MB)

@krasnikoff your file as is not working as is, but I extracted the target face and tried the process here, and it is working fine.
Please see the image and try the blendshape transfer process with the attached file?

Valera_head.usda (430.8 KB)

image

Thanks for your reply!
Finally, I managed to get blendshapes with my original file. Can’t say, what was the problem.