writes to the console:

[Skins] Item with shortname "shortname" does not exist. Please review your Skins configuration.

in the game:

https://sun9-54.userapi.com/impg/2n984eUT0QP3A4DAPgzDUqKfRStqCzqQBTCCVQ/RpMsrd-5uyA.jpg?size=719x952&quality=96&sign=ec0ea2f6727451491ad9a927625cf2f8&type=album

just remove the example shortname from the .json