migrate command fails with foreign key to user model

I have used django in the past, but not for some time.  So the changes surrounding the user models are new to me.  I downloaded v1.7b2 and proceeded to start a new development I am planning.  However I came across a problem when trying to run migrate after generating the migrations on an app that has a model that contains a foreign key to the user model.  So I created a simple test app to isolate the problem, with a model defined as below:

from django.db import models

from django.conf import settings

class TestModel(models.Model):

    user = models.ForeignKey(settings.AUTH_USER_MODEL)

When I run "makemigrations test_app" the migrations seem to be created fine as there are no errors produced.  However when I run "migrate" I get the folllowing errors:

C:\Users\osborn_r\django\test_project>python manage.py migrate

Operations to perform:

  Synchronize unmigrated apps: admin, contenttypes, auth, sessions

  Apply all migrations: test_app, auth

Synchronizing apps without migrations:

  Creating tables...

  Installing custom SQL...

  Installing indexes...

Running migrations:

  Applying test_app.0001_initial...Traceback (most recent call last):

  File "manage.py", line 10, in <module>

    execute_from_command_line(sys.argv)

  File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line

427, in execute_from_command_line

    utility.execute()

  File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line

419, in execute

    self.fetch_command(subcommand).run_from_argv(self.argv)

  File "C:\Python27\lib\site-packages\django\core\management\base.py", line 288,

 in run_from_argv

    self.execute(*args, **options.__dict__)

  File "C:\Python27\lib\site-packages\django\core\management\base.py", line 337,

 in execute

    output = self.handle(*args, **options)

  File "C:\Python27\lib\site-packages\django\core\management\commands\migrate.py

", line 145, in handle

    executor.migrate(targets, plan, fake=options.get("fake", False))

  File "C:\Python27\lib\site-packages\django\db\migrations\executor.py", line 60

, in migrate

    self.apply_migration(migration, fake=fake)

  File "C:\Python27\lib\site-packages\django\db\migrations\executor.py", line 88

, in apply_migration

    if self.detect_soft_applied(migration):

  File "C:\Python27\lib\site-packages\django\db\migrations\executor.py", line 13

2, in detect_soft_applied

    apps = project_state.render()

  File "C:\Python27\lib\site-packages\django\db\migrations\state.py", line 63, i

n render

    model=dangling_lookup[0]))

ValueError: Lookup failed for model referenced by field auth.Permission.content_

type: contenttypes.ContentType

Can anyone spot what I have done wrong?

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