invalid output was: Traceback (most recent call last):
  File "/root/.ansible/tmp/ansible-1389347811.77-199739516584317/gce", line 1446, in <module>
    main()
  File "/root/.ansible/tmp/ansible-1389347811.77-199739516584317/gce", line 407, in main
    module, gce, inames)
  File "/root/.ansible/tmp/ansible-1389347811.77-199739516584317/gce", line 246, in create_instances
    lc_image = gce.ex_get_image(image)
  File "/usr/local/lib/python2.7/dist-packages/libcloud/compute/drivers/gce.py", line 2176, in ex_get_image
    image = self._match_images('debian-cloud', partial_name)
  File "/usr/local/lib/python2.7/dist-packages/libcloud/compute/drivers/gce.py", line 664, in _match_images
    project_images = self.list_images(project)
  File "/usr/local/lib/python2.7/dist-packages/libcloud/compute/drivers/gce.py", line 836, in list_images
    response.get('items', [])]
  File "/usr/local/lib/python2.7/dist-packages/libcloud/compute/drivers/gce.py", line 2472, in _to_node_image
    extra['preferredKernel'] = image['preferredKernel']
KeyError: 'preferredKernel'