CentOS virt - Aug 2008 - Not file system fox xbd0 (dev 0x8e00) cannot mount root, error =79

I get the following error does anybody know how to fix it.
Thanks,


root device (default xbd0a): ex0
use one of: xbd0[a-p] xennet0 md0[a-p] ddb halt reboot
root device (default xbd0a): xbd0a
dump device (default xbd0b): xbd0b
file system (default generic): generic
root on xbd0a dumps on xbd0b
mountroot: trying lfs...
mountroot: trying ffs...
mountroot: trying ext2fs...
mountroot: trying nfs...
mountroot: trying smbfs...
mountroot: trying ntfs...
mountroot: trying msdos...
mountroot: trying cd9660...
mountroot: trying coda...
no file system for xbd0 (dev 0x8e00)
cannot mount root, error = 79

Thanks,
- Augustin
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