Error importing middleware django.contrib.sessions.middleware

Hello,
I removed Memcached from django then i restarted Apache, but I am getting an ImproperlyConfigured error on account of custom middleware:

ImproperlyConfigured: Error importing middleware django.contrib.sessions.middleware: "No module named base"

[error] mod_wsgi (pid=758249): Exception occurred processing WSGI script '/home/super/webapps/djapp/osqa.wsgi'.  [error] Traceback (most recent call last):  [error] File "/home/super/webapps/djapp/lib/python2.7/django/core/handlers/wsgi.py", line 232, in __call__  [error] self.load_middleware()  [error] File "/home/super/webapps/djapp/lib/python2.7/django/core/handlers/base.py", line 42, in load_middleware  [error] raise exceptions.ImproperlyConfigured('Error importing middleware %s: "%s"' % (mw_module, e))  [error] ImproperlyConfigured: Error importing middleware django.contrib.sessions.middleware: "No module named base"

This the relevant parts of my settings.py file:

MIDDLEWARE_CLASSES = [      'django.contrib.sessions.middleware.SessionMiddleware',      'django.middleware.common.CommonMiddleware',      'forum.middleware.extended_user.ExtendedUser',      'forum.middleware.anon_user.ConnectToSessionMessagesMiddleware',      'forum.middleware.request_utils.RequestUtils',      'forum.middleware.cancel.CancelActionMiddleware',      'forum.middleware.admin_messages.AdminMessagesMiddleware',      'django.middleware.transaction.TransactionMiddleware',  ]    INSTALLED_APPS = [      'django.contrib.auth',      'django.contrib.contenttypes',      'django.contrib.sessions',      'django.contrib.sites',      'django.contrib.admin',      'django.contrib.humanize',      'django.contrib.sitemaps',      'django.contrib.markup',      'forum',  ]

And my *.wsgi file.

import os  import sys    sys.path.append('/home/super/webapps/djapp/qa')  os.environ['DJANGO_SETTINGS_MODULE'] = 'qa.settings'  import django.core.handlers.wsgi  application = django.core.handlers.wsgi.WSGIHandler()

In lib/python2.7/django/contrib/sessions i have __init__.py and middleware.py files but there is no a middleware directory instead there is backends folder.
The base.py is inside the backends folder lib/python2.7/django/contrib/sessions/backends and within this folder I also have __init__.py.

Do you have any ideas what the issue may be and what's I need to do to resolve it?
Thank you so much.

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