Error starting pimame-web-frontend

[zbbfufu]

After upgrade to 0.8.0b7, web frontend do not work anymore. ssh and ftp are ok.

I tried to start it manually :

pi@piplqy ~/pimame/controller-setup $ sudo gunicorn app:app -b 0.0.0.0:80
2015-02-21 15:51:49 [3018] [INFO] Starting gunicorn 0.14.5
2015-02-21 15:51:49 [3018] [INFO] Listening at: http://0.0.0.0:80 (3018)
2015-02-21 15:51:49 [3018] [INFO] Using worker: sync
2015-02-21 15:51:49 [3021] [INFO] Booting worker with pid: 3021
2015-02-21 15:51:49 [3021] [INFO] Worker exiting (pid: 3021)
2015-02-21 15:51:50 [3018] [INFO] Shutting down: Master
2015-02-21 15:51:50 [3018] [INFO] Reason: Worker failed to boot.