Fedora xen - Mar 2007 - When starting a Xen Domain U - import grub.fsys gives "ImportError: No module named fsys"

Hello,

I had installed a domain called XenGuest (Fedora Core 6) on i386
machine with the gnome virtual manager applet.

After installation finished succesfully and running :
xm create -c  /etc/xen/XenGuest

I get the following error:
Using config file "/etc/xen/XenGuest".
Traceback (most recent call last):
  File "/usr/bin/pygrub", line 26, in ?
    import grub.fsys
ImportError: No module named fsys

Is some python module is missing ?

"rpm -q python" returns:
python-2.4.4-1.fc6


My machine is FC6 on i386.

"uname -a" returns:
Linux myhost 2.6.19-1.2911.6.4.fc6xen #1 SMP Sat Feb 24 14:57:17
     EST 2007 i686 i686 i386 GNU/Linux

Any ideas?
Mark