从1.8升级到django 1.9时，出现此错误。我检查了类似问题的答案，但我认为这不是任何第三方软件包或应用程序的问题。

Traceback (most recent call last):
File "manage.py", line 10, in <module> execute_from_command_line(sys.argv)
File "/home/kishore/.virtualenvs/andone/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 350, in execute_from_command_line
utility.execute()
File "/home/kishore/.virtualenvs/andone/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 342, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/kishore/.virtualenvs/andone/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 176, in fetch_command
commands = get_commands()
File "/home/kishore/.virtualenvs/andone/local/lib/python2.7/site-packages/django/utils/lru_cache.py", line 100, in wrapper
result = user_function(*args, **kwds)
File "/home/kishore/.virtualenvs/andone/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 71, in get_commands
for app_config in reversed(list(apps.get_app_configs())):
File "/home/kishore/.virtualenvs/andone/local/lib/python2.7/site-packages/django/apps/registry.py", line 137, in get_app_configs
self.check_apps_ready()
File "/home/kishore/.virtualenvs/andone/local/lib/python2.7/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.

我已经为“ django.contrib.auth”修改了已安装的应用程序。