initial_data.json

[{
    "pk": 1,
    "model": "auth.user",
    "fields": {
        "username": "admin",
        "first_name": "",
        "last_name": "",
        "is_active": true,
        "is_superuser": true,
        "is_staff": true,
        "last_login": "2013-10-04T23:58:16Z",
        "groups": [],
        "user_permissions": [],
        "password": "pbkdf2_sha256$10000$TinFrvc34uKO$pOCziU7HO9ttS/0pkvp9SyfBiDcWQUc5fdk5GKTJpGc=",
        "email": "root@example.com",
        "date_joined": "2013-10-04T23:58:16Z"
    }
}]

Running sentry --conf=sentry.conf.py upgrade raises AttributeError: Problem installing fixture 'initial_data.json': 'NoneType' object has no attribute 'using'

Traceback (most recent call last):
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/django/core/management/base.py", line 222, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/django/core/management/base.py", line 255, in execute
    output = self.handle(*args, **options)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/sentry/management/commands/upgrade.py", line 26, in handle
    call_command('syncdb', migrate=True, interactive=(not options['noinput']))
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/django/core/management/__init__.py", line 161, in call_command
    return klass.execute(*args, **defaults)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/django/core/management/base.py", line 255, in execute
    output = self.handle(*args, **options)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/django/core/management/base.py", line 385, in handle
    return self.handle_noargs(**options)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/south/management/commands/syncdb.py", line 92, in handle_noargs
    syncdb.Command().execute(**options)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/raven/contrib/django/management/__init__.py", line 37, in new_execute
    return original_func(self, *args, **kwargs)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/django/core/management/base.py", line 255, in execute
    output = self.handle(*args, **options)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/django/core/management/base.py", line 385, in handle
    return self.handle_noargs(**options)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/django/core/management/commands/syncdb.py", line 163, in handle_noargs
    database=db, skip_validation=True)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/django/core/management/__init__.py", line 161, in call_command
    return klass.execute(*args, **defaults)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/raven/contrib/django/management/__init__.py", line 37, in new_execute
    return original_func(self, *args, **kwargs)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/django/core/management/base.py", line 255, in execute
    output = self.handle(*args, **options)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/django/core/management/commands/loaddata.py", line 193, in handle
    obj.save(using=using)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/django/core/serializers/base.py", line 165, in save
    models.Model.save_base(self.object, using=using, raw=True)
  File "/home/iromli/.virtualenv/sentry-dev/lib/python2.7/site-packages/django/db/models/base.py", line 622, in save_base
    manager.using(using).filter(pk=pk_val).exists())):
AttributeError: Problem installing fixture 'initial_data.json': 'NoneType' object has no attribute 'using'

The model changed to "model": "sentry.user"