Django调试工具栏抛出'；非类型'；对象没有属性'_meta&x27；

我正在使用Django==1.4.5，Python==2.7.5，并尝试使用类似Django调试工具栏的探查器。 我已按照文档要求在本地设置中应用了以下设置：-

如果调试： 内部_IPS=（'127.0.0.1'，） 中间件\u类+=( “调试工具条.中间件.调试工具条中间件”， )

我收到此错误“NoneType”对象没有属性“\u meta”

Traceback:
File "/Users/nikhilverma/workspace/BHANE/pyenv/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  136.                     response = response.render()
File "/Users/nikhilverma/workspace/BHANE/pyenv/lib/python2.7/site-packages/django/template/response.py" in render
  104.             self._set_content(self.rendered_content)
File "/Users/nikhilverma/workspace/BHANE/pyenv/lib/python2.7/site-packages/django/template/response.py" in rendered_content
  81.         content = template.render(context)
File "/Users/nikhilverma/workspace/BHANE/pyenv/lib/python2.7/site-packages/django/template/base.py" in render
  140.             return self._render(context)
File "/Users/nikhilverma/workspace/BHANE/pyenv/lib/python2.7/site-packages/django/test/utils.py" in instrumented_test_render
  61.     template_rendered.send(sender=self, template=self, context=context)
File "/Users/nikhilverma/workspace/BHANE/pyenv/lib/python2.7/site-packages/django/dispatch/dispatcher.py" in send
  172.             response = receiver(signal=self, sender=sender, **named)
File "/Users/nikhilverma/workspace/BHANE/pyenv/lib/python2.7/site-packages/debug_toolbar/panels/templates/panel.py" in _store_template_info
  114.                             value.model._meta.app_label, value.model.__name__)

Exception Type: AttributeError at /
Exception Value: 'NoneType' object has no attribute '_meta'

请指教

Traceback:
File "/Users/nikhilverma/workspace/BHANE/pyenv/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  136.                     response = response.render()
File "/Users/nikhilverma/workspace/BHANE/pyenv/lib/python2.7/site-packages/django/template/response.py" in render
  104.             self._set_content(self.rendered_content)
File "/Users/nikhilverma/workspace/BHANE/pyenv/lib/python2.7/site-packages/django/template/response.py" in rendered_content
  81.         content = template.render(context)
File "/Users/nikhilverma/workspace/BHANE/pyenv/lib/python2.7/site-packages/django/template/base.py" in render
  140.             return self._render(context)
File "/Users/nikhilverma/workspace/BHANE/pyenv/lib/python2.7/site-packages/django/test/utils.py" in instrumented_test_render
  61.     template_rendered.send(sender=self, template=self, context=context)
File "/Users/nikhilverma/workspace/BHANE/pyenv/lib/python2.7/site-packages/django/dispatch/dispatcher.py" in send
  172.             response = receiver(signal=self, sender=sender, **named)
File "/Users/nikhilverma/workspace/BHANE/pyenv/lib/python2.7/site-packages/debug_toolbar/panels/templates/panel.py" in _store_template_info
  114.                             value.model._meta.app_label, value.model.__name__)

Exception Type: AttributeError at /
Exception Value: 'NoneType' object has no attribute '_meta'