I selected KDE, chromium, google fonts, steam+playonlinux, firewall, samba, printing, aur, libreoffice. Then after everything downloaded, cnchi gave me this error and closed. I made a root partition and a home partition and made the /boot/efi partition the same one windows uses without formatting.
EDIT: I forgot to say that I used the latest iso : antergos-2016.06.14-x86_64 . and cnchi version was 0.14.94