Python 3.4, Django 1.7b1 - Can't migrate django-postman

(byvshie) 95-26-79-115:byvshie lorddaedra$ ./manage.py syncdb
Traceback (most recent call last):
  File "./manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/lorddaedra/Envs/byvshie/lib/python3.4/site-packages/django/core/management/__init__.py", line 427, in execute_from_command_line
    utility.execute()
  File "/Users/lorddaedra/Envs/byvshie/lib/python3.4/site-packages/django/core/management/__init__.py", line 391, in execute
    django.setup()
  File "/Users/lorddaedra/Envs/byvshie/lib/python3.4/site-packages/django/__init__.py", line 21, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/Users/lorddaedra/Envs/byvshie/lib/python3.4/site-packages/django/apps/registry.py", line 106, in populate
    app_config.import_models(all_models)
  File "/Users/lorddaedra/Envs/byvshie/lib/python3.4/site-packages/django/apps/config.py", line 190, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/local/Cellar/python3/3.4.1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/importlib/__init__.py", line 109, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2226, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1129, in _exec
  File "<frozen importlib._bootstrap>", line 1471, in exec_module
  File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
  File "/Users/lorddaedra/Envs/byvshie/lib/python3.4/site-packages/postman/models.py", line 42, in <module>
    'f': 'sender__' + get_user_model().USERNAME_FIELD,     # as 'from'
  File "/Users/lorddaedra/Envs/byvshie/lib/python3.4/site-packages/django/contrib/auth/__init__.py", line 129, in get_user_model
    return django_apps.get_model(settings.AUTH_USER_MODEL)
  File "/Users/lorddaedra/Envs/byvshie/lib/python3.4/site-packages/django/apps/registry.py", line 187, in get_model
    self.check_ready()
  File "/Users/lorddaedra/Envs/byvshie/lib/python3.4/site-packages/django/apps/registry.py", line 119, in check_ready
    raise RuntimeError("App registry isn't ready yet.")
RuntimeError: App registry isn't ready yet.

Some similar problem: https://groups.google.com/forum/#!topic/django-developers/lmT1JxsWHPo "The docs recommend using settings.AUTH_USER_MODEL rather than get_user_model() as the target of ForeignKeys."

https://code.djangoproject.com/ticket/21875

Docs: https://docs.djangoproject.com/en/dev/topics/auth/customizing/#referencing-the-user-model

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