title: AttributeError: 'tuple' object has no attribute 'insert'
body: <p>I have installed the following, from <a href="http://www.django-mongodb.org/topics/setup.html" rel="nofollow">http://www.django-mongodb.org/topics/setup.html</a></p>
  
  <p>django-nonrel </p>
  
  <p>djangotoolbox </p>
  
  <p>mongodb-engine </p>
  
  <p>after installing i tried to run my program using <code>python manage.py runserver</code></p>
  
  <p>it showing an error like the following,</p>
  
  <pre><code>Validating models...
  
  Unhandled exception in thread started by &lt;bound method Command.inner_run of &lt;django.contrib.staticfiles.management.commands.runserver.Command object at 0x1655450&gt;&gt;
  Traceback (most recent call last):
    File "/home/sakeer/workspace/entevirtual/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 92, in inner_run
      self.validate(display_num_errors=True)
    File "/home/sakeer/workspace/entevirtual/lib/python2.7/site-packages/django/core/management/base.py", line 280, in validate
      num_errors = get_validation_errors(s, app)
    File "/home/sakeer/workspace/entevirtual/lib/python2.7/site-packages/django/core/management/validation.py", line 28, in get_validation_errors
      from django.db import models, connection
    File "/home/sakeer/workspace/entevirtual/lib/python2.7/site-packages/django/db/__init__.py", line 40, in &lt;module&gt;
      backend = load_backend(connection.settings_dict['ENGINE'])
    File "/home/sakeer/workspace/entevirtual/lib/python2.7/site-packages/django/db/__init__.py", line 34, in __getattr__
      return getattr(connections[DEFAULT_DB_ALIAS], item)
    File "/home/sakeer/workspace/entevirtual/lib/python2.7/site-packages/django/db/utils.py", line 93, in __getitem__
      backend = load_backend(db['ENGINE'])
    File "/home/sakeer/workspace/entevirtual/lib/python2.7/site-packages/django/db/utils.py", line 27, in load_backend
      return import_module('.base', backend_name)
    File "/home/sakeer/workspace/entevirtual/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module
      __import__(name)
    File "/home/sakeer/workspace/entevirtual/lib/python2.7/site-packages/django_mongodb_engine-0.4.0-py2.7.egg/django_mongodb_engine/__init__.py", line 13, in &lt;module&gt;
  
  AttributeError: 'tuple' object has no attribute 'insert'
  </code></pre>
  
  <p>i am using Django 1.5   and python 2.7</p>
  
  <p>thanks in advance</p>