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Hi, I have similar problem, I'm using devstack on ubuntu 12.04, so how to do? Thanks

Message Virtual Interface creation failed Code 500 Details File "/opt/stack/nova/nova/compute/manager.py", line 301, in decorated_function return function(self, context, args, *kwargs) File "/opt/stack/nova/nova/compute/manager.py", line 2120, in run_instance do_run_instance() File "/opt/stack/nova/nova/openstack/common/lockutils.py", line 249, in inner return f(args, *kwargs) File "/opt/stack/nova/nova/compute/manager.py", line 2119, in do_run_instance legacy_bdm_in_spec) File "/opt/stack/nova/nova/compute/manager.py", line 1237, in _run_instance notify("error", fault=e) # notify that build failed File "/opt/stack/nova/nova/openstack/common/excutils.py", line 82, in __exit__ six.reraise(self.type_, self.value, self.tb) File "/opt/stack/nova/nova/compute/manager.py", line 1221, in _run_instance instance, image_meta, legacy_bdm_in_spec) File "/opt/stack/nova/nova/compute/manager.py", line 1364, in _build_instance network_info.wait(do_raise=False) File "/opt/stack/nova/nova/openstack/common/excutils.py", line 82, in __exit__ six.reraise(self.type_, self.value, self.tb) File "/opt/stack/nova/nova/compute/manager.py", line 1341, in _build_instance set_access_ip=set_access_ip) File "/opt/stack/nova/nova/compute/manager.py", line 401, in decorated_function return function(self, context, args, *kwargs) File "/opt/stack/nova/nova/compute/manager.py", line 1758, in _spawn LOG.exception(_('Instance failed to spawn'), instance=instance) File "/opt/stack/nova/nova/openstack/common/excutils.py", line 82, in __exit__ six.reraise(self.type_, self.value, self.tb) File "/opt/stack/nova/nova/compute/manager.py", line 1755, in _spawn block_device_info) File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 2287, in spawn block_device_info) File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 3699, in _create_domain_and_network raise exception.VirtualInterfaceCreateException()