xen: unable to open an initial console

[mauro.ferrario na gmail.com]

Hello.
I have a Linux Fedora core 4, i am trying to boot from the xen kernel
2.6
that i've just installed. But unfortunately when i boot the domain0 i
get this
error: "Warning: unable to open an initial console"

I write you down the lines i have in my grub.conf

title Xen 2.0 / XenLinux 2.6
  kernel /boot/xen-2.0.gz dom0_mem=131072
  module /boot/vmlinuz-2.6-xen0 root=/dev/sda1 ro console=tty0

Anybody can help me?

Thanx a lot.
-Mauro