Requested setting TEMPLATE_DEBUG, but settings are not configured.

 Django 引入模版报错，

  File "/usr/lib/python2.6/site-packages/django/conf/__init__.py", line 47, in _setup

    % (desc, ENVIRONMENT_VARIABLE))

django.core.exceptions.ImproperlyConfigured: Requested setting DEFAULT_INDEX_TABLESPACE, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.

解决：