django.contrib.contenttypes.models.ContentType doesn't declare an explicit app_label

[jakfu...@gmail.com]

I'm getting the below stacktrace error when I try to runserver or makemigrations:

Traceback (most recent call last):

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

    execute_from_command_line(sys.argv)

  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 350, in execute_from_command_line

    utility.execute()

  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 342, in execute

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

  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 348, in run_from_argv

    self.execute(*args, **cmd_options)

  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 398, in execute

    self.check()

  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 426, in check

    include_deployment_checks=include_deployment_checks,

  File "/usr/local/lib/python2.7/dist-packages/django/core/checks/registry.py", line 75, in run_checks

    new_errors = check(app_configs=app_configs)

  File "/usr/local/lib/python2.7/dist-packages/django/core/checks/urls.py", line 10, in check_url_config

    return check_resolver(resolver)

  File "/usr/local/lib/python2.7/dist-packages/django/core/checks/urls.py", line 19, in check_resolver

    for pattern in resolver.url_patterns:

  File "/usr/local/lib/python2.7/dist-packages/django/utils/functional.py", line 33, in __get__

    res = instance.__dict__[self.name] = self.func(instance)

  File "/usr/local/lib/python2.7/dist-packages/django/core/urlresolvers.py", line 417, in url_patterns

    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)

  File "/usr/local/lib/python2.7/dist-packages/django/utils/functional.py", line 33, in __get__

    res = instance.__dict__[self.name] = self.func(instance)

  File "/usr/local/lib/python2.7/dist-packages/django/core/urlresolvers.py", line 410, in urlconf_module

    return import_module(self.urlconf_name)

  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module

    __import__(name)

  File "/home/ubuntu/workspace/hyp_api/urls.py", line 22, in <module>

    url(r'^admin/', admin.site.urls),

  File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/sites.py", line 303, in urls

    return self.get_urls(), 'admin', self.name

  File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/sites.py", line 258, in get_urls

    from django.contrib.contenttypes import views as contenttype_views

  File "/usr/local/lib/python2.7/dist-packages/django/contrib/contenttypes/views.py", line 5, in <module>

    from django.contrib.contenttypes.models import ContentType

  File "/usr/local/lib/python2.7/dist-packages/django/contrib/contenttypes/models.py", line 159, in <module>

    class ContentType(models.Model):

  File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py", line 103, in __new__

    "application was loaded. " % (module, name))

RuntimeError: Model class django.contrib.contenttypes.models.ContentType doesn't declare an explicit app_label and either isn't in an application in INSTALLED_APPS or else was imported before its application was loaded. 

I've looked at the following S/O and github discussions:

http://stackoverflow.com/questions/29635765/django-1-9-deprecation-warnings-app-label

https://github.com/tomchristie/django-rest-framework/issues/3262

Here are my INSTALLED_APPS and REST_FRAMEWORK variables from my settings.py file:

INSTALLED_APPS = [

    'django.contrib.auth',

    'django.contrib.contenttypes',

    'django.contrib.sessions',

    'django.contrib.sites',

    'django.contrib.messages',

    'django.contrib.staticfiles',

    'django.contrib.admin',

    # Uncomment the next line to enable admin documentation:

    # 'django.contrib.admindocs',

    'rest_framework',

    'hypes_REST',

]

REST_FRAMEWORK = {

    'UNAUTHENTICATED_USER': None,

    'DEFAULT_AUTHENTICATION_CLASSES' : [],

    'DEFAULT_PERMISSION_CLASSES' : [],

}

I was just working on some nested serializers and this error started coming up. My models have app_labels explicitly defined, but since I'm working on the cloud 9 platform I can't go in and explicitly define app_labels for django.contrib.contenttypes.models.ContentType

I'm not sure if this has to do with some other unrelated issue since these installed apps were working just fine 1 hour ago.