devstack error on instance launch

gistfile1.txt

[stack@cloudtest:~/devstack] sudo nova-rootwrap /etc/nova/rootwrap.conf env CONFIG_FILE=["/etc/nova/nova.conf"] NETWORK_ID=1 dnsmasq --strict-order --bind-interfaces --conf-file= --pid-file=/opt/stack/data/nova/networks/nova-br100.pid --listen-address=10.0.0.1 --except-interface=lo --dhcp-range=set:private,10.0.0.2,static,255.255.255.0,120s --dhcp-lease-max=256 --dhcp-hostsfile=/opt/stack/data/nova/networks/nova-br100.conf --dhcp-script=/usr/bin/nova-dhcpbridge --leasefile-ro --domain=novalocal
Traceback (most recent call last):
  File "/usr/bin/nova-dhcpbridge", line 10, in <module>
    sys.exit(main())
  File "/opt/stack/nova/nova/cmd/dhcpbridge.py", line 98, in main
    default_config_files=jsonutils.loads(os.environ['CONFIG_FILE']))
  File "/opt/stack/nova/nova/openstack/common/jsonutils.py", line 164, in loads
    return json.loads(s)
  File "/usr/lib64/python2.6/json/__init__.py", line 307, in loads
    return _default_decoder.decode(s)
  File "/usr/lib64/python2.6/json/decoder.py", line 319, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib64/python2.6/json/decoder.py", line 336, in raw_decode
    obj, end = self._scanner.iterscan(s, **kw).next()
  File "/usr/lib64/python2.6/json/scanner.py", line 55, in iterscan
    rval, next_pos = action(m, context)
  File "/usr/lib64/python2.6/json/decoder.py", line 219, in JSONArray
    raise ValueError(errmsg("Expecting object", s, end))
ValueError: Expecting object: line 1 column 1 (char 1)

dnsmasq: lease-init script returned exit code 1