TrunsMac Errors

Hello
I'm trying to create bootable USB using the tutorial at the FAQ
https://www.insanelymac.com/forum/topic/329828-making-a-bootable-high-sierra-usb-installer-entirely-from-scratch-in-windows-or-linux-mint-without-access-to-mac-or-app-store-installerapp/

But at the step of :

Transmac to Copy "SharedSupport" folder to OS X Base System

First I had problem which was "NO MAC VOLUME FOUND" but after doing search for volumes I got problem that I can't Do the Copy Here
TransMac is running as administrator

https://i.redd.it/nv940qd2rmn21.png