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我有一个运行 django 1.7.4 的网站，我正在尝试升级到 django 1.9.5：

当我跑步时，./manage.py runserver我得到：

Unhandled exception in thread started by <function wrapper at 0x111306c80>
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/django/utils/autoreload.py", line 226, in wrapper
    fn(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 109, in inner_run
    autoreload.raise_last_exception()
  File "/usr/local/lib/python2.7/site-packages/django/utils/autoreload.py", line 249, in raise_last_exception
    six.reraise(*_exception)
  File "/usr/local/lib/python2.7/site-packages/django/utils/autoreload.py", line 226, in wrapper
    fn(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/django/__init__.py", line 18, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/usr/local/lib/python2.7/site-packages/django/apps/registry.py", line 85, in populate
    app_config = AppConfig.create(entry)
  File "/usr/local/lib/python2.7/site-packages/django/apps/config.py", line 90, in create
    module = import_module(entry)
  File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/Users/myuser/projects/mysite/myapp/__init__.py", line 1, in <module>
    import signals
  File "/Users/myuser/projects/mysite/myapp/signals.py", line 1, in <module>
    from paypal.standard.models import ST_PP_COMPLETED
  File "/usr/local/lib/python2.7/site-packages/paypal/standard/models.py", line 44, in <module>
    class PayPalStandardBase(Model):
  File "/usr/local/lib/python2.7/site-packages/django/db/models/base.py", line 94, in __new__
    app_config = apps.get_containing_app_config(module)
  File "/usr/local/lib/python2.7/site-packages/django/apps/registry.py", line 239, in get_containing_app_config
    self.check_apps_ready()
  File "/usr/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.

我在 virtualenv 中安装了 django 1.7.4，并且使用该版本一切正常。当我尝试使用 django 1.9 运行它时，会出现此错误。有任何想法吗？

（我已经尝试按照其他答案中的建议添加django.setup()，settings.py但它没有帮助（并且阅读文档我觉得它不应该在那里）

谢谢您的帮助。

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