maasadmin@maas:~$ juju-deployer -c restonos.yaml -e restonMaas
2015-09-02 17:15:35 Using deployment restonos.yaml
2015-09-02 17:15:35 Starting deployment of restonos.yaml
2015-09-02 17:15:35 Creating machines...
2015-09-02 17:15:35 Machine 11 will be created
Traceback (most recent call last):
  File "/usr/bin/juju-deployer", line 9, in <module>
    load_entry_point('juju-deployer==0.5.1', 'console_scripts', 'juju-deployer')()
  File "/usr/lib/python2.7/dist-packages/deployer/cli.py", line 135, in main
    run()
  File "/usr/lib/python2.7/dist-packages/deployer/cli.py", line 233, in run
    importer.Importer(env, deployment, options).run()
  File "/usr/lib/python2.7/dist-packages/deployer/action/importer.py", line 303, in run
    self.create_machines()
  File "/usr/lib/python2.7/dist-packages/deployer/action/importer.py", line 114, in create_machines
    constraints=spec.get('constraints'))
  File "/usr/lib/python2.7/dist-packages/deployer/env/go.py", line 42, in add_machine
    constraints=parse_constraints(constraints))['Machine']
  File "/usr/lib/python2.7/dist-packages/jujuclient.py", line 832, in add_machine
    return self.add_machines([params])['Machines'][0]
  File "/usr/lib/python2.7/dist-packages/jujuclient.py", line 843, in add_machines
    "MachineParams": machines}})
  File "/usr/lib/python2.7/dist-packages/jujuclient.py", line 281, in _rpc
    raise EnvError(result)
jujuclient.EnvError: <Env Error - Details:
 {   u'Error': u'json: cannot unmarshal string into Go value of type []string',
    u'RequestId': 1,
    u'Response': {   }}
 >