django1.8 与 django xadmin 的使用问题，我本地使用 django+xadmin 都是可以正常启动的，但是在 centos7 上启动启动报错，

请问大家有遇到过这种问题么， stackoverflow 的 import django ； django.setup()解决办法不可用。 如果在服务器上不适用 xadmin ，就可以正常启动
具体错误
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
utility.execute()
File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 312, in execute
django.setup()
File "/usr/lib/python2.7/site-packages/django/__init__.py", line 18, in setup
apps.populate(settings.INSTALLED_APPS)
File "/usr/lib/python2.7/site-packages/django/apps/registry.py", line 108, in populate
app_config.import_models(all_models)
File "/usr/lib/python2.7/site-packages/django/apps/config.py", line 198, in import_models
self.models_module = import_module(models_module_name)
File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/usr/lib/python2.7/site-packages/xadmin/models.py", line 19, in <module>
AUTH_USER_MODEL = django.contrib.auth.get_user_model()
File "/usr/lib/python2.7/site-packages/django/contrib/auth/__init__.py", line 150, in get_user_model
return django_apps.get_model(settings.AUTH_USER_MODEL)
File "/usr/lib/python2.7/site-packages/django/apps/registry.py", line 199, in get_model
self.check_models_ready()
File "/usr/lib/python2.7/site-packages/django/apps/registry.py", line 131, in check_models_ready
raise AppRegistryNotReady("Models aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: Models aren't loaded yet.