Juju-quickstart error message lacks detailed error info

I was trying out juju-quickstart, and ran into a very weird error when trying to bootstrap a bundle.

$ juju-quickstart u/landscape/landscape-dense-maas
usage: juju-quickstart [-h] [-e ENV_NAME] [-n BUNDLE_NAME] [-i] [-u]
                       [--gui-charm-url CHARM_URL] [--gui-port PORT]
                       [--no-browser] [--environments-file ENV_FILE]
                       [--distro-only] [--ppa] [--version] [--debug]
                       [--description] [--upload-tools]
                       [--upload-series UPLOAD_SERIES]
                       [--constraints CONSTRAINTS]
                       [BUNDLE]
juju-quickstart: error: cannot use the maas environment:
file not found in the specified path

After running juju-quickstart -i, it pointed me to a error in the authorized_keys path that if it had told me exactly which path was incorrect or which setting, would have been much less confusing. In hindsight I realise now that its the only path in the file, but it really wasn't clear what was erroring out - initially I thought it may have been on the bundle I was trying to use.

I'm using juju 1.24.6-trusty-amd64 from the stable PPA on trusty.

Please let me know if you need any more information.