ASKBOT_EXTRA_SKINS_DIR usage

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Trying to make a custom skin and after reading the askbot/skins/README, I added this line in settings.py

#ASKBOT_EXTRA_SKINS_DIR = os.path.join(os.path.dirname(__file__), 'askbot', 'skins')
ASKBOT_EXTRA_SKINS_DIR = '/tmp/skins'

... and here is the directory structure. base.html was just copied from askbot module

/tmp/skins/
└── test
    ├── media
    └── templates
        └── base.html

2 directories, 1 file

Now I restart the uwsgi I hit the application trough a browser and in the uwsgi application log file (where I use to see application tracebacks) I have this :

Thu Jan 17 15:55:53 2013 - DAMN ! worker 1 (pid: 1502) died :( trying respawn ...
Thu Jan 17 15:55:53 2013 - Respawned uWSGI worker 1 (new pid: 1514)
Thu Jan 17 15:55:53 2013 - DAMN ! worker 2 (pid: 1509) died :( trying respawn ...
Thu Jan 17 15:55:53 2013 - Respawned uWSGI worker 2 (new pid: 1515)

No error, no traceback, nothing. As the application does not respond, nginx end up with a 502 Bad Gateway

Did I do something wrong with the changes I mentioned here before ?

Is the skin system in beta state ?