I am trying to make an old Django project run again. After seemingly having solved issues with old sorl.thumbnail versions and deprecated expressions I now get this error when running

python manage.py runserver

I also tried to copy & paste my old files into a new Django project and get the exactly same error. Maybe someone here has a clue where the problem lies?

Unhandled exception in thread started by <bound method Command.inner_run of <django.contrib.staticfiles.management.commands.runserver.Command object at 0x2a80510>>
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/django/core/management/commands/runserver.py", line 88, in inner_run
    self.validate(display_num_errors=True)
  File "/usr/lib/python2.7/dist-packages/django/core/management/base.py", line 249, in validate
    num_errors = get_validation_errors(s, app)
  File "/usr/lib/python2.7/dist-packages/django/core/management/validation.py", line 35, in get_validation_errors
    for (app_name, error) in get_app_errors().items():
  File "/usr/lib/python2.7/dist-packages/django/db/models/loading.py", line 146, in get_app_errors
    self._populate()
  File "/usr/lib/python2.7/dist-packages/django/db/models/loading.py", line 61, in _populate
    self.load_app(app_name, True)
  File "/usr/lib/python2.7/dist-packages/django/db/models/loading.py", line 78, in load_app
    models = import_module('.models', app_name)
  File "/usr/lib/python2.7/dist-packages/django/utils/importlib.py", line 35, in import_module
    __import__(name)
  File "/home/me/Documents/wdws/wdws/../wdws/cityofwindows/models.py", line 73, in <module>
    class Image(models.Model):
  File "/home/me/Documents/wdws/wdws/../wdws/cityofwindows/models.py", line 83, in Image
    'large': {'size': (640, 640)},
  File "/usr/lib/python2.7/dist-packages/django/db/models/fields/files.py", line 233, in __init__
    super(FileField, self).__init__(verbose_name, name, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'extra_thumbnails'

I need to re-build the project just for visual documentation locally... so also any hints on how to quickly re-run outdated django-projects are very welcome!!

Thanks a lot

(using Ubuntu 12.04)