[CentOS] Just installed DomU won't boot

Hi, I am using Centos 5.4 x86_64 with kernel 2.6.18-164.11.1.el5xen.
I've installed a Centos 5.4 (64 bit too) DomU (paravirtualized),
process was apparently with no problems, but DomU refuses to start,
this the error:

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/engine.py", line 498, in run_domain
    vm.startup()
  File "/usr/share/virt-manager/virtManager/domain.py", line 573, in startup
    self.vm.create()
  File "/usr/lib64/python2.4/site-packages/libvirt.py", line 287, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: La operación POST falló: xend_post: error del demonio de
xen: (xend.err "Error creating domain: Boot loader didn't return any
data!")

End of Error Message.

Config file is as follows:

name = "fido"
uuid = "af13748d-6084-2357-73b7-0c7ff9ed9553"
maxmem = 1500
memory = 1500
vcpus = 16
bootloader = "/usr/bin/pygrub"
on_poweroff = "destroy"
on_reboot = "restart"
on_crash = "restart"
vfb = [ "type=vnc,vncunused=1,keymap=es" ]
disk = [ "phy:/dev/VolGroup00/LogVol02,xvda,w" ]
vif = [ "mac=00:16:36:19:a7:66,bridge=xenbr0,script=vif-bridge" ]


Please could you tell me what'w wrong with it?

Thanks in advance!!


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