lucky(~/devel/swift-test) % juju-deployer -c swift-next.yaml -d trusty-liberty
2016-02-01 15:34:11 [DEBUG] deployer.cli: Using runtime GoEnvironment on ap-southeast-2
2016-02-01 15:34:11 [INFO] deployer.cli: Starting deployment of trusty-liberty
Traceback (most recent call last):
  File "/usr/bin/juju-deployer", line 9, in <module>
    load_entry_point('juju-deployer==0.3.6', 'console_scripts', 'juju-deployer')()
  File "/usr/lib/python2.7/dist-packages/deployer/cli.py", line 127, in main
    run()
  File "/usr/lib/python2.7/dist-packages/deployer/cli.py", line 225, in run
    importer.Importer(env, deployment, options).run()
  File "/usr/lib/python2.7/dist-packages/deployer/action/importer.py", line 182, in run
    self.env.connect()
  File "/usr/lib/python2.7/dist-packages/deployer/env/go.py", line 69, in connect
    self.get_cli_status()
  File "/usr/lib/python2.7/dist-packages/deployer/env/go.py", line 96, in get_cli_status
    status = super(GoEnvironment, self).get_cli_status()
  File "/usr/lib/python2.7/dist-packages/deployer/env/base.py", line 153, in get_cli_status
    status = yaml_load(output)
  File "/usr/lib/python2.7/dist-packages/deployer/utils.py", line 65, in yaml_load
    return yaml.load(value, Loader=SafeLoader)
  File "/usr/lib/python2.7/dist-packages/yaml/__init__.py", line 71, in load
    return loader.get_single_data()
  File "/usr/lib/python2.7/dist-packages/yaml/constructor.py", line 37, in get_single_data
    node = self.get_single_node()
  File "_yaml.pyx", line 708, in _yaml.CParser.get_single_node (ext/_yaml.c:8324)
  File "_yaml.pyx", line 905, in _yaml.CParser._parse_next_event (ext/_yaml.c:11046)
yaml.parser.ParserError: did not find expected <document start>
  in "<byte string>", line 2, column 1