Trouble in getting django session on app engine

I have read this and tried using django sessions. And i got error - ImproperlyConfigured: settings.DATABASES is improperly configured. Please supply the ENGINE value. Check settings documentation for more details.

ERROR    2013-03-20 09:51:09,865 base.py:215] Internal Server Error: /common/show/captcha/contactInquiry
Traceback (most recent call last):
  File "/home/suja/Dev/resources/google_appengine/lib/django-1.4/django/core/handlers/base.py", line 188, in get_response
    response = middleware_method(request, response)
  File "/home/suja/Dev/resources/google_appengine/lib/django-1.4/django/contrib/sessions/middleware.py", line 36, in process_response
    request.session.save()
  File "/home/suja/Dev/resources/google_appengine/lib/django-1.4/django/contrib/sessions/backends/db.py", line 51, in save
    session_key=self._get_or_create_session_key(),
  File "/home/suja/Dev/resources/google_appengine/lib/django-1.4/django/contrib/sessions/backends/base.py", line 145, in _get_or_create_session_key
    self._session_key = self._get_new_session_key()
  File "/home/suja/Dev/resources/google_appengine/lib/django-1.4/django/contrib/sessions/backends/base.py", line 139, in _get_new_session_key
    if not self.exists(session_key):
  File "/home/suja/Dev/resources/google_appengine/lib/django-1.4/django/contrib/sessions/backends/db.py", line 27, in exists
    return Session.objects.filter(session_key=session_key).exists()
  File "/home/suja/Dev/resources/google_appengine/lib/django-1.4/django/db/models/query.py", line 565, in exists
    return self.query.has_results(using=self.db)
  File "/home/suja/Dev/resources/google_appengine/lib/django-1.4/django/db/models/sql/query.py", line 441, in has_results
    return bool(compiler.execute_sql(SINGLE))
  File "/home/suja/Dev/resources/google_appengine/lib/django-1.4/django/db/models/sql/compiler.py", line 808, in execute_sql
    sql, params = self.as_sql()
  File "/home/suja/Dev/resources/google_appengine/lib/django-1.4/django/db/models/sql/compiler.py", line 71, in as_sql
    out_cols = self.get_columns(with_col_aliases)
  File "/home/suja/Dev/resources/google_appengine/lib/django-1.4/django/db/models/sql/compiler.py", line 180, in get_columns
    result = ['(%s) AS %s' % (col[0], qn2(alias)) for alias, col in self.query.extra_select.iteritems()]
  File "/home/suja/Dev/resources/google_appengine/lib/django-1.4/django/db/backends/dummy/base.py", line 15, in complain
    raise ImproperlyConfigured("settings.DATABASES is improperly configured. "


I am using dev_appserver.datastore. Pls do help..

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