Grizzly ERROR [quantum.agent.dhcp_agent] Unable to enable

atsize@network-node:/etc/init.d$ cd /etc/init.d/; for i in $( ls quantum-* ); do sudo service $i restart; done
quantum-dhcp-agent stop/waiting
quantum-dhcp-agent start/running, process 20595
quantum-l3-agent stop/waiting
quantum-l3-agent start/running, process 20608
quantum-metadata-agent stop/waiting
quantum-metadata-agent start/running, process 20617
quantum-plugin-openvswitch-agent stop/waiting
quantum-plugin-openvswitch-agent start/running, process 20626
hatsize@network-node:/etc/init.d$ less /var/log/quantum/dhcp-agent.log
2013-04-26 06:21:22     INFO [quantum.openstack.common.rpc.common] Connected to AMQP server on 10.10.10.51:5672
2013-04-26 06:21:22    DEBUG [quantum.openstack.common.rpc.service] Creating Consumer connection for Service dhcp_agent
2013-04-26 06:21:22     INFO [quantum.agent.dhcp_agent] DHCP agent started
2013-04-26 06:21:22     INFO [quantum.agent.dhcp_agent] Synchronizing state
2013-04-26 06:21:22    DEBUG [quantum.openstack.common.rpc.amqp] Making synchronous call on q-plugin ...
2013-04-26 06:21:22    DEBUG [quantum.openstack.common.rpc.amqp] MSG_ID is c5bcbee1abc241cdb52ed45a8098abbf
2013-04-26 06:21:22    DEBUG [quantum.openstack.common.rpc.amqp] UNIQUE_ID is b113e0a011094d59a5f80317b6824edb.
2013-04-26 06:21:22    DEBUG [quantum.openstack.common.rpc.amqp] Making synchronous call on q-plugin ...
2013-04-26 06:21:22    DEBUG [quantum.openstack.common.rpc.amqp] MSG_ID is c0e5955e4ce8492cbeb430804e106b84
2013-04-26 06:21:22    DEBUG [quantum.openstack.common.rpc.amqp] UNIQUE_ID is 7960a0e465c34457bddcbafda2c8a34e.
2013-04-26 06:21:22    DEBUG [quantum.openstack.common.rpc.amqp] Making synchronous call on q-plugin ...
2013-04-26 06:21:22    DEBUG [quantum.openstack.common.rpc.amqp] MSG_ID is bd9f9e3d0df04b52b0a3e932c1afb890
2013-04-26 06:21:22    DEBUG [quantum.openstack.common.rpc.amqp] UNIQUE_ID is 1f4290a3baa94c87a192d107da867ea6.
2013-04-26 06:21:22    DEBUG [quantum.agent.linux.utils] Running command: ['sudo', 'quantum-rootwrap', '/etc/quantum/rootwrap.conf', 'ip', 'netns', 'exec', 'qdhcp-aada20e3-3250-461c-8891-5f9102f4028b', 'ip', '-o', 'link', 'show', 'ns-8aa229b2-1d']
2013-04-26 06:21:23    DEBUG [quantum.agent.linux.utils]
Command: ['sudo', 'quantum-rootwrap', '/etc/quantum/rootwrap.conf', 'ip', 'netns', 'exec', 'qdhcp-aada20e3-3250-461c-8891-5f9102f4028b', 'ip', '-o', 'link', 'show', 'ns-8aa229b2-1d']
Exit code: 1
Stdout: ''
Stderr: 'Cannot open network namespace: No such file or directory\n'
2013-04-26 06:21:23    DEBUG [quantum.agent.linux.utils] Running command: ['sudo', 'quantum-rootwrap', '/etc/quantum/rootwrap.conf', 'ip', 'netns', 'exec', 'qdhcp-aada20e3-3250-461c-8891-5f9102f4028b', 'ip', '-o', 'link', 'show', 'ns-8aa229b2-1d']
2013-04-26 06:21:23    DEBUG [quantum.agent.linux.utils]
Command: ['sudo', 'quantum-rootwrap', '/etc/quantum/rootwrap.conf', 'ip', 'netns', 'exec', 'qdhcp-aada20e3-3250-461c-8891-5f9102f4028b', 'ip', '-o', 'link', 'show', 'ns-8aa229b2-1d']
Exit code: 1
Stdout: ''
Stderr: 'Cannot open network namespace: No such file or directory\n'
2013-04-26 06:21:23    DEBUG [quantum.agent.linux.utils] Running command: ['sudo', 'quantum-rootwrap', '/etc/quantum/rootwrap.conf', 'ip', 'link', 'add', 'tap8aa229b2-1d', 'type', 'veth', 'peer', 'name', 'ns-8aa229b2-1d']
2013-04-26 06:21:23    DEBUG [quantum.agent.linux.utils]
Command: ['sudo', 'quantum-rootwrap', '/etc/quantum/rootwrap.conf', 'ip', 'link', 'add', 'tap8aa229b2-1d', 'type', 'veth', 'peer', 'name', 'ns-8aa229b2-1d']
Exit code: 2
Stdout: ''
Stderr: 'RTNETLINK answers: File exists\n'
2013-04-26 06:21:23    ERROR [quantum.agent.dhcp_agent] Unable to enable dhcp.
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/quantum/agent/dhcp_agent.py", line 129, in call_driver
    getattr(driver, action)()
  File "/usr/lib/python2.7/dist-packages/quantum/agent/linux/dhcp.py", line 117, in enable
    reuse_existing=True)
  File "/usr/lib/python2.7/dist-packages/quantum/agent/dhcp_agent.py", line 550, in setup
    namespace=namespace)
  File "/usr/lib/python2.7/dist-packages/quantum/agent/linux/interface.py", line 234, in plug
    root_veth, ns_veth = ip.add_veth(tap_name, device_name)
  File "/usr/lib/python2.7/dist-packages/quantum/agent/linux/ip_lib.py", line 95, in add_veth
    ('add', name1, 'type', 'veth', 'peer', 'name', name2))
  File "/usr/lib/python2.7/dist-packages/quantum/agent/linux/ip_lib.py", line 47, in _as_root
    namespace)
  File "/usr/lib/python2.7/dist-packages/quantum/agent/linux/ip_lib.py", line 58, in _execute
    root_helper=root_helper)
  File "/usr/lib/python2.7/dist-packages/quantum/agent/linux/utils.py", line 61, in execute
    raise RuntimeError(m)
RuntimeError:
Command: ['sudo', 'quantum-rootwrap', '/etc/quantum/rootwrap.conf', 'ip', 'link', 'add', 'tap8aa229b2-1d', 'type', 'veth', 'peer', 'name', 'ns-8aa229b2-1d']
Exit code: 2
Stdout: ''
Stderr: 'RTNETLINK answers: File exists\n'