Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/amqp.py", line 461, in _process_data
    **args)
  File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/dispatcher.py", line 172, in dispatch
    result = getattr(proxyobj, method)(ctxt, **kwargs)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 353, in decorated_function
    return function(self, context, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 90, in wrapped
    payload)
  File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 73, in wrapped
    return f(self, context, *args, **kw)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 243, in decorated_function
    pass
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 229, in decorated_function
    return function(self, context, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 294, in decorated_function
    function(self, context, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 271, in decorated_function
    e, sys.exc_info())
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 258, in decorated_function
    return function(self, context, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1832, in start_instance
    self._power_on(context, instance)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1819, in _power_on
    block_device_info)
  File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 1948, in power_on
    self._hard_reboot(context, instance, network_info, block_device_info)
  File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 1899, in _hard_reboot
    write_to_disk=True)
  File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 3040, in to_xml
    disk_info, rescue, block_device_info)
  File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2920, in get_guest_config
    inst_type):
  File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2697, in get_guest_storage_config
    inst_type)
  File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2660, in get_guest_disk_conf

    self.get_hypervisor_version())
TypeError: libvirt_info() takes exactly 6 arguments (7 given)