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libvirtError: Failed to add tap interface to bridge 'br100': No such process

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I have installed Essex in vlan mode. I am getting  the following error 
 
libvirtError: Failed to add tap interface to bridge 'br100': No such process

I see vlan100 and br100 up and running.
Any help is appreciated.
 
 
2012-05-27 20:59:30 DEBUG nova.utils [req-b0db1f8b-fbf4-4d5a-b254-d354c4befacf e3875ae91f3f45bbb1312bc2c4f32302 54dcafb79fcf4438a849bde92a432363] Running cmd (subprocess): qemu-img create -f qcow2 -o cluster_size=2M,backing_file=/var/lib/nova/instances/_base/c2ea5228abd40afed21736a8300efcde93bb09fc /var/lib/nova/instances/instance-00000035/disk from (pid=4774) execute /usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/utils.py:219
2012-05-27 20:59:30 ERROR nova.compute.manager [req-b0db1f8b-fbf4-4d5a-b254-d354c4befacf e3875ae91f3f45bbb1312bc2c4f32302 54dcafb79fcf4438a849bde92a432363] [instance: 0724908c-4754-4bef-969b-40a16ce5dda6] Instance failed to spawn
2012-05-27 20:59:30 TRACE nova.compute.manager [instance: 0724908c-4754-4bef-969b-40a16ce5dda6] Traceback (most recent call last):
2012-05-27 20:59:30 TRACE nova.compute.manager [instance: 0724908c-4754-4bef-969b-40a16ce5dda6]   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py", line 592, in _spawn
2012-05-27 20:59:30 TRACE nova.compute.manager [instance: 0724908c-4754-4bef-969b-40a16ce5dda6]     self._legacy_nw_info(network_info), block_device_info)
2012-05-27 20:59:30 TRACE nova.compute.manager [instance: 0724908c-4754-4bef-969b-40a16ce5dda6]   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/exception.py", line 114, in wrapped
2012-05-27 20:59:30 TRACE nova.compute.manager [instance: 0724908c-4754-4bef-969b-40a16ce5dda6]     return f(*args, **kw)
2012-05-27 20:59:30 TRACE nova.compute.manager [instance: 0724908c-4754-4bef-969b-40a16ce5dda6]   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/virt/libvirt/connection.py", line 904, in spawn
2012-05-27 20:59:30 TRACE nova.compute.manager [instance: 0724908c-4754-4bef-969b-40a16ce5dda6]     self._create_new_domain(xml)
2012-05-27 20:59:30 TRACE nova.compute.manager [instance: 0724908c-4754-4bef-969b-40a16ce5dda6]   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/virt/libvirt/connection.py", line 1557, in _create_new_domain
2012-05-27 20:59:30 TRACE nova.compute.manager [instance: 0724908c-4754-4bef-969b-40a16ce5dda6]     domain.createWithFlags(launch_flags)
2012-05-27 20:59:30 TRACE nova.compute.manager [instance: 0724908c-4754-4bef-969b-40a16ce5dda6]   File "/usr/lib/python2.7/dist-packages/libvirt.py", line 372, in createWithFlags
2012-05-27 20:59:30 TRACE nova.compute.manager [instance: 0724908c-4754-4bef-969b-40a16ce5dda6]     if ret == -1: raise libvirtError ('virDomainCreateWithFlags() failed', dom=self)
2012-05-27 20:59:30 TRACE nova.compute.manager [instance: 0724908c-4754-4bef-969b-40a16ce5dda6] libvirtError: Failed to add tap interface to bridge 'br100': No such process
2012-05-27 20:59:30 TRACE nova.compute.manager [instance: 0724908c-4754-4bef-969b-40a16ce5dda6]
2012-05-27 20:59:30 DEBUG nova.compute.manager [req-b0db1f8b-fbf4-4d5a-b254-d354c4befacf e3875ae91f3f45bbb1312bc2c4f32302 54dcafb79fcf4438a849bde92a432363] [instance: 0724908c-4754-4bef-969b-40a16ce5dda6] Deallocating network for instance from (pid=4774) _deallocate_network /usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py:616
2012-05-27 20:59:30 DEBUG nova.rpc.amqp [req-b0db1f8b-fbf4-4d5a-b254-d354c4befacf e3875ae91f3f45bbb1312bc2c4f32302 54dcafb79fcf4438a849bde92a432363] Making asynchronous cast on network... from (pid=4774) cast /usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/rpc/amqp.py:346
2012-05-27 20:59:31 ERROR nova.rpc.amqp [req-b0db1f8b-fbf4-4d5a-b254-d354c4befacf e3875ae91f3f45bbb1312bc2c4f32302 54dcafb79fcf4438a849bde92a432363] Exception during message handling
2012-05-27 20:59:31 TRACE nova.rpc.amqp Traceback (most recent call last):
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/rpc/amqp.py", line 252, in _process_data
2012-05-27 20:59:31 TRACE nova.rpc.amqp     rval = node_func(context=ctxt, **node_args)
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/exception.py", line 114, in wrapped
2012-05-27 20:59:31 TRACE nova.rpc.amqp     return f(*args, **kw)
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py", line 177, in decorated_function
2012-05-27 20:59:31 TRACE nova.rpc.amqp     sys.exc_info())
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2012-05-27 20:59:31 TRACE nova.rpc.amqp     self.gen.next()
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py", line 171, in decorated_function
2012-05-27 20:59:31 TRACE nova.rpc.amqp     return function(self, context, instance_uuid, *args, **kwargs)
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py", line 651, in run_instance
2012-05-27 20:59:31 TRACE nova.rpc.amqp     do_run_instance()
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/utils.py", line 945, in inner
2012-05-27 20:59:31 TRACE nova.rpc.amqp     retval = f(*args, **kwargs)
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py", line 650, in do_run_instance
2012-05-27 20:59:31 TRACE nova.rpc.amqp     self._run_instance(context, instance_uuid, **kwargs)
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py", line 451, in _run_instance
2012-05-27 20:59:31 TRACE nova.rpc.amqp     self._set_instance_error_state(context, instance_uuid)
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2012-05-27 20:59:31 TRACE nova.rpc.amqp     self.gen.next()
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py", line 432, in _run_instance
2012-05-27 20:59:31 TRACE nova.rpc.amqp     self._deallocate_network(context, instance)
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2012-05-27 20:59:31 TRACE nova.rpc.amqp     self.gen.next()
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py", line 429, in _run_instance
2012-05-27 20:59:31 TRACE nova.rpc.amqp     injected_files, admin_password)
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/compute/manager.py", line 592, in _spawn
2012-05-27 20:59:31 TRACE nova.rpc.amqp     self._legacy_nw_info(network_info), block_device_info)
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/exception.py", line 114, in wrapped
2012-05-27 20:59:31 TRACE nova.rpc.amqp     return f(*args, **kw)
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/virt/libvirt/connection.py", line 904, in spawn
2012-05-27 20:59:31 TRACE nova.rpc.amqp     self._create_new_domain(xml)
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/nova-2012.1-py2.7.egg/nova/virt/libvirt/connection.py", line 1557, in _create_new_domain
2012-05-27 20:59:31 TRACE nova.rpc.amqp     domain.createWithFlags(launch_flags)
2012-05-27 20:59:31 TRACE nova.rpc.amqp   File "/usr/lib/python2.7/dist-packages/libvirt.py", line 372, in createWithFlags
2012-05-27 20:59:31 TRACE nova.rpc.amqp     if ret == -1: raise libvirtError ('virDomainCreateWithFlags() failed', dom=self)
2012-05-27 20:59:31 TRACE nova.rpc.amqp libvirtError: Failed to add tap interface to bridge 'br100': No such process


Thanks,
-vj
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