AppRegistryNotReady Error

[Ivan Koval]

Migrating my project from 1.8.5 to 1.9b1 cause next traceback, when running server:

Traceback (most recent call last):
  File "/Users/.../manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/.../env3/lib/python3.5/site-packages/django/core/management/__init__.py", line 350, in execute_from_command_line
    utility.execute()
  File "/Users/.../env3/lib/python3.5/site-packages/django/core/management/__init__.py", line 342, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/.../env3/lib/python3.5/site-packages/django/core/management/__init__.py", line 176, in fetch_command
    commands = get_commands()
  File "/Users/.../env3/lib/python3.5/site-packages/django/core/management/__init__.py", line 71, in get_commands
    for app_config in reversed(list(apps.get_app_configs())):
  File "/Users/.../env3/lib/python3.5/site-packages/django/apps/registry.py", line 137, in get_app_configs
    self.check_apps_ready()
  File "/Users/.../env3/lib/python3.5/site-packages/django/apps/registry.py", line 124, in check_apps_ready
    raise AppRegistryNotReady("Apps aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.

Process finished with exit code 1

And my manage.py is pretty simple:

#!/usr/bin/env python
import os
import sys

if __name__ == "__main__":
    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "settings.base")

    from django.core.management import execute_from_command_line

    execute_from_command_line(sys.argv)