Kernal Panic not Synchin - on hypervisor install

OK,

So i got my rhev manager built, and now im installing  the hyperviros on another host,

I boot from the iso ( rhevh-6.2-20111026.3.el6.iso )

and followin on screen directions, select the disk to use, enter a password, and press enter to reboot, i unmount iso, and the machine reboots,

then i get Kernal Panic not Synching  - Attempted to kill init,

Any clues ?

Thanks

Laurence