second domU: Error: Device 768 (vbd) could not be connected. Hotplug scripts not working

[Victor Gamov <vitspec%gmail.com@localhost>]

Hi All

I successfully run dom0 as NetBSD-5.0.1 + Xen-3.3.1

Then first domU was configured and successfully started with config like this:
-------------------- cut here -----------------------
kernel = "/usr/pkg/lib/xen/boot/hvmloader"
builder='hvm'
memory = 1024
name = "fbsd-1"
vif = [ 'bridge=bridge0, type=ioemu' ]

device_model = '/usr/pkg/libexec/qemu-dm'

disk =  [    'file:/VM/fbsd-1/os,ioemu:hda,w',
                'file:/VM/fbsd-1/disk1,ioemu:hdb,w',
                'file:/VM/fbsd-disk-ports,ioemu:hdc,w',
                'file:/var/7.2-RELEASE-amd64-disc1.iso,ioemu:hdd:cdrom,r'
        ]
boot='c'
vnc = 1
vncdisplay = 0
usb=1
-------------------- /cut here -----------------------

FreeBSD booted (initially from CD then installed and booted from hda)
and worked now

With still running domU-1 I do:
# cp /VM/fbsd-1/os /VM/fbsd-2/os

Then I try to run second domU with following config:
-------------------- cut here -----------------------
kernel = "/usr/pkg/lib/xen/boot/hvmloader"
builder='hvm'
memory = 1024
name = "fbsd-2"
vif = [ 'bridge=bridge0, type=ioemu' ]

device_model = '/usr/pkg/libexec/qemu-dm'

disk =  [    'file:/VM/fbsd-2/os,ioemu:hda,w',
                'file:/VM/fbsd-2/disk1,ioemu:hdb,w',
                'file:/VM/fbsd-disk-ports,ioemu:hdc,w',
                'file:/var/7.2-RELEASE-amd64-disc1.iso,ioemu:hdd:cdrom,r'
        ]
boot='c'
vnc = 1
vncdisplay = 2
usb=1
-------------------- /cut here -----------------------

But `xm create' paused at few minutes and then says:

Error: Device 768 (vbd) could not be connected. Hotplug scripts not working.

While xm running then domu-2 at 'Paused' state. Then it destroyed

Can anybody explain me where is my problem?

Thanks!

-- 
CU,
Victor Gamov