instances not running

I installed Openstack on ubuntu in hp xw4600 machine . when i start an instance it shows scheduling (gets the ip address)->launching-> shutdown ...i don't know what's the problem ..below is the details

//nova-compute.log file

(nova.compute.manager): TRACE: File "/usr/lib/pymodules/python2.6/nova/compute/manager.py", line 234, in run_instance
(nova.compute.manager): TRACE: self.driver.spawn(instance_ref)
(nova.compute.manager): TRACE: File "/usr/lib/pymodules/python2.6/nova/exception.py", line 126, in _wrap
(nova.compute.manager): TRACE: raise Error(str(e))
(nova.compute.manager): TRACE: Error: internal error process exited while connecting to monitor: char device redirected to /dev/pts/1
(nova.compute.manager): TRACE: qemu: could not load kernel '/var/lib/nova/instances/instance-00000020/kernel': Permission denied
(nova.compute.manager): TRACE:
(nova.compute.manager): TRACE:
2011-09-28 16:26:25,084 INFO nova.compute.manager [-] Found instance 'instance-00000020' in DB but no VM. State=5, so setting state to shutoff.

if I run
$lsmod|grep kvm

kvm_intel 46456 0
kvm 286599 1 kvm_intel

$kvm on
qemu: could not open disk image on: No such file or directory

But VT is enabled in BIOS...