TypeError "takes exactly 2 arguments (4 given)" raised while deploying

[Felipe Reyes]

While running "juju deployer -c simple.yaml simple" I consistently get the following error:

2014-10-20 11:34:37 Starting deployment of simple
Traceback (most recent call last):
  File "/usr/bin/juju-deployer", line 9, in <module>
    load_entry_point('juju-deployer==0.4.1', '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 186, in run
    self.get_charms()
  File "/usr/lib/python2.7/dist-packages/deployer/action/importer.py", line 67, in get_charms
    self.deployment.resolve(self.options.overrides or ())
  File "/usr/lib/python2.7/dist-packages/deployer/deployment.py", line 148, in resolve
    self.validate_placement()
  File "/usr/lib/python2.7/dist-packages/deployer/deployment.py", line 245, in validate_placement
    feedback.extend(placement.validate())
  File "/usr/lib/python2.7/dist-packages/deployer/service.py", line 96, in validate
    self.service.name, unit_placement[idx])
TypeError: error() takes exactly 2 arguments (4 given)
ERROR subprocess encountered error code 1

Packages:
* juju-core 1.20.9-0ubuntu1~14.10.1~juju
* juju-deployer 0.4.1-1

I'm using Ubuntu 14.10, but juju is installed from ppa:juju/stable. The configuration file used is attached.

[Felipe Reyes (freyes)]

FYI, I get the same stacktrace when using juju-deployer 0.4.3 (installed from pypi)

[Lucas Eznarriaga (lezbar)]

sorry, it was a mistake to change the status from Fix Committed -> Fix Released but I cannot revert it back.