csr_iso_modify_mac.sh does not work with 16.12

[RunSi]

The serial modification script does not work the csr1000v-universalk9.16.12.01a.iso

The following error is given
/var/folders/91/5smkq55n6472f6d49p_mh50w0000gn/T/tmp.GD1WsJnG ~/mycode/N9000/N9000_CSR/vagrant_net_prog/box_building
/dev/disk5 /Volumes/ISOIMAGE
cp: /Volumes/CDROM/*: No such file or directory
sed: iso/boot/grub/menu.lst: No such file or directory
mkisofs: Uh oh, I cant find the boot image 'boot/grub/stage2_eltorito' inside the target tree.
hdiutil: unmount: "/Volumes/CDROM" failed to unmount due to error 2.
hdiutil: unmount failed - No such file or directory