Manjaro-tools grub

After building using buildiso, if i go in var/lib/manjaro-tools/…./x86_64/rootfs/boot ther’ s not the folder “grub” wich should container grubenv.

Is this possible that because of it when i launch iso file in live and try to install using calamares, i get an error during bootloader installation (grub-mkconfig -o /boot/grub/grub.cfg returned with exit status code 1.

I’ getting creazy. I don t know if is this a problem of calamares or of tools or something else.