python manage.py runserver报错了

Traceback (most recent call last):

  File "manage.py", line 10, in <module>

    execute_from_command_line(sys.argv)

  File "/usr/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line

    utility.execute()

  File "/usr/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 312, in execute

    django.setup()

  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 108, in populate

    app_config.import_models(all_models)

  File "/usr/local/lib/python2.7/site-packages/django/apps/config.py", line 198, in import_models

    self.models_module = import_module(models_module_name)

  File "/usr/local/lib/python2.7/importlib/__init__.py", line 37, in import_module

    __import__(name)

  File "/usr/local/lib/python2.7/site-packages/django/contrib/auth/models.py", line 41, in <module>

    class Permission(models.Model):

  File "/usr/local/lib/python2.7/site-packages/django/db/models/base.py", line 139, in __new__

    new_class.add_to_class('_meta', Options(meta, **kwargs))

  File "/usr/local/lib/python2.7/site-packages/django/db/models/base.py", line 324, in add_to_class

    value.contribute_to_class(cls, name)

  File "/usr/local/lib/python2.7/site-packages/django/db/models/options.py", line 250, in contribute_to_class

    self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())

  File "/usr/local/lib/python2.7/site-packages/django/db/__init__.py", line 36, in __getattr__

    return getattr(connections[DEFAULT_DB_ALIAS], item)

  File "/usr/local/lib/python2.7/site-packages/django/db/utils.py", line 240, in __getitem__

    backend = load_backend(db['ENGINE'])

  File "/usr/local/lib/python2.7/site-packages/django/db/utils.py", line 111, in load_backend

    return import_module('%s.base' % backend_name)

  File "/usr/local/lib/python2.7/importlib/__init__.py", line 37, in import_module

    __import__(name)

  File "/usr/local/lib/python2.7/site-packages/django/db/backends/sqlite3/base.py", line 36, in <module>

    raise ImproperlyConfigured("Error loading either pysqlite2 or sqlite3 modules (tried in that order): %s" % exc)

django.core.exceptions.ImproperlyConfigured: Error loading either pysqlite2 or sqlite3 modules (tried in that order): No module named _sqlite3