Comment 4 for bug 1204302

The issue here explained by Tim P. is that when you have the following line in you config.yaml:
    # root-dir: ~/.juju/local

Juju does not expand "~/" our correctly so the path is not found correctly. Two workarounds are:
(1) Comment out this line as mentioned above.
(2) Uncomment the line, and put the full path in ie:
      root-dir: /home/user/.juju/local

-thanks,
Antoino