Error creating Live CD

Missing EFI file (/boot/efi/EFI/*/shimx64.efi)
Missing EFI file (/boot/efi/EFI/*/gcdx64.efi)
Failed to copy EFI files, no EFI Support will be included.
Missing initial EFI bootloader, skipping efiboot.img creation.
usage: mkefiboot [-h] [--debug] [-d] [-a] [-l LABEL] [-i ICONFILE] [-n DISKNAME] [-p PRODUCT] EFIBOOTDIR OUTPUTFILE
mkefiboot: error: /var/tmp/imgcreate-pkbok1y2/iso-suquwhnf/EFI/BOOT is not a directory
Error creating Live CD : Unable to unmount filesystem at /var/tmp/imgcreate-pkbok1y2/install_root/sys. The process using the imgcreate module, or one of the libraries used by that process, leaked a reference to the filesystem. Please report a bug at <https://github.com/livecd-tools/livecd-tools/issues>.