You can build this iso if you have the right version of Archiso. Archiso is a package supplied by Arch Linux that will always undergo changes. You can follow up the versions via this link. https://www.archlinux.org/packages/extra/any/archiso/ We are now using this version archiso-version=archiso 58-2 sudo pacman -Q archiso and you will know your version Downgrade to this version via a command in the terminal if you have a higher version. `sudo downgrade archiso` and choose the right version. Add it to the ignore list of pacman. If you have a lower version then update your system. Check to see if archiso is not added to your /etc/pacman.conf in the list of ignores. Delete it if it is in there. Then update.