the problem you got you need to install kernel-power booting for mutiboot
go to your terminal and enter
code:
sudo gainroot
then
code:
apt-get install kernel-power-bootimg kernel-power-modules
then when it finish install tip in this command
code:
apt-get install multiboot-kernel-power
then you finish just reboot you will see it in multiboot
if you want more info just go to this site:http://forum.nitdroid.com/index.php?topic=84.0
hope this help you