Unable to complete install '<type 'exceptions.AttributeError'> 'NoneType' object has no attribute 'get_xml_config'
Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/create.py", line 616, in do_install
    dom = guest.start_install(False, meter = meter)
  File "/usr/lib/python2.5/site-packages/virtinst/Guest.py", line 724, in start_install
    return self._do_install(consolecb, meter)
  File "/usr/lib/python2.5/site-packages/virtinst/Guest.py", line 737, in _do_install
    install_xml = self.get_config_xml()
  File "/usr/lib/python2.5/site-packages/virtinst/Guest.py", line 709, in get_config_xml
    "devices": self._get_device_xml(install), \
  File "/usr/lib/python2.5/site-packages/virtinst/FullVirtGuest.py", line 195, in _get_device_xml
    """ + Guest.Guest._get_device_xml(self, install)
  File "/usr/lib/python2.5/site-packages/virtinst/Guest.py", line 671, in _get_device_xml
    "networks": self._get_network_xml(install), \
  File "/usr/lib/python2.5/site-packages/virtinst/Guest.py", line 650, in _get_network_xml
    ret += n.get_xml_config()
AttributeError: 'NoneType' object has no attribute 'get_xml_config'
'