Produits Entr'ouvert » Calebasse

Lorsque je clique sur le bouton "Ajouter" après la modification d'un lieu de socialisation j'obtiens:

ImproperlyConfigured at /cmpp/ressources/school/95/

No URL to redirect to. Either provide a url or define a get_absolute_url method on the Model.

Request Method: POST
Request URL: http://127.0.0.1:8000/cmpp/ressources/school/95/
Django Version: 1.5.4
Exception Type: ImproperlyConfigured
Exception Value:

No URL to redirect to. Either provide a url or define a get_absolute_url method on the Model.

Exception Location: /usr/local/lib/python2.7/dist-packages/django/views/generic/edit.py in get_success_url, line 119
Python Executable: /usr/bin/python
Python Version: 2.7.4
Python Path:

['/Donnees/devs/aps42/calebasse-1.2/calebasse',
'/Donnees/devs/aps42/calebasse-1.2/calebasse',
'/usr/local/lib/python2.7/site-packages',
'/usr/lib/python2.7',
'/usr/lib/python2.7/plat-x86_64-linux-gnu',
'/usr/lib/python2.7/lib-tk',
'/usr/lib/python2.7/lib-old',
'/usr/lib/python2.7/lib-dynload',
'/usr/local/lib/python2.7/dist-packages',
'/usr/local/lib/python2.7/dist-packages/PIL',
'/usr/lib/python2.7/dist-packages',
'/usr/lib/python2.7/dist-packages/PILcompat',
'/usr/lib/python2.7/dist-packages/gst-0.10',
'/usr/lib/python2.7/dist-packages/gtk-2.0',
'/usr/lib/pymodules/python2.7',
'/usr/lib/python2.7/dist-packages/ubuntu-sso-client',
'/usr/lib/python2.7/dist-packages/ubuntuone-client',
'/usr/lib/python2.7/dist-packages/ubuntuone-control-panel',
'/usr/lib/python2.7/dist-packages/ubuntuone-couch',
'/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol',
'/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode']

Server time: jeu, 21 Aoû 2014 09:53:11 +0200