Nova-network error

2011-08-05 22:38:40,413 CRITICAL nova [-] Unexpected error while running command.
Command: sudo -E dnsmasq --strict-order --bind-interfaces --conf-file= --domain=novalocal --pid-file=/var/lib/nova/networks/nova-br100.pid --listen-address=192.168.2.1 --except-interface=lo --dhcp-range=192.168.2.3,static,120s --dhcp-hostsfile=/var/lib/nova/networks/nova-br100.conf --dhcp-script=/usr/bin/nova-dhcpbridge --leasefile-ro
Exit code: 2
Stdout: ''
Stderr: '\ndnsmasq: failed to create listening socket for 192.168.2.1: Address already in use\n'
(nova): TRACE: Traceback (most recent call last):
(nova): TRACE:   File "/usr/bin/nova-network", line 48, in <module>
(nova): TRACE:     service.serve()
(nova): TRACE:   File "/usr/lib/pymodules/python2.7/nova/service.py", line 290, in serve
(nova): TRACE:     x.start()
(nova): TRACE:   File "/usr/lib/pymodules/python2.7/nova/service.py", line 84, in start
(nova): TRACE:     self.manager.init_host()
(nova): TRACE:   File "/usr/lib/pymodules/python2.7/nova/network/manager.py", line 499, in init_host
(nova): TRACE:     super(VlanManager, self).init_host()
(nova): TRACE:   File "/usr/lib/pymodules/python2.7/nova/network/manager.py", line 134, in init_host
(nova): TRACE:     self._on_set_network_host(ctxt, network['id'])
(nova): TRACE:   File "/usr/lib/pymodules/python2.7/nova/network/manager.py", line 629, in _on_set_network_host
(nova): TRACE:     self.driver.update_dhcp(context, network_id)
(nova): TRACE:   File "/usr/lib/pymodules/python2.7/nova/utils.py", line 607, in inner
(nova): TRACE:     retval = f(*args, **kwargs)
(nova): TRACE:   File "/usr/lib/pymodules/python2.7/nova/network/linux_net.py", line 588, in update_dhcp
(nova): TRACE:     _execute(*command, addl_env=env)
(nova): TRACE:   File "/usr/lib/pymodules/python2.7/nova/network/linux_net.py", line 666, in _execute
(nova): TRACE:     return utils.execute(*cmd, **kwargs)
(nova): TRACE:   File "/usr/lib/pymodules/python2.7/nova/utils.py", line 173, in execute
(nova): TRACE:     cmd=' '.join(cmd))
(nova): TRACE: ProcessExecutionError: Unexpected error while running command.
(nova): TRACE: Command: sudo -E dnsmasq --strict-order --bind-interfaces --conf-file= --domain=novalocal --pid-file=/var/lib/nova/networks/nova-br100.pid --listen-address=192.168.2.1 --except-interface=lo --dhcp-range=192.168.2.3,static,120s --dhcp-hostsfile=/var/lib/nova/networks/nova-br100.conf --dhcp-script=/usr/bin/nova-dhcpbridge --leasefile-ro
(nova): TRACE: Exit code: 2
(nova): TRACE: Stdout: ''
(nova): TRACE: Stderr: '\ndnsmasq: failed to create listening socket for 192.168.2.1: Address already in use\n'
(nova): TRACE: