django-secure crashing my site

I was interested in imposing https on my entire python django project. I found this solution and it looks promising. I made these changes to the equivalent of my settings.py

SECURE_SSL_REDIRECT = True
SECURE_HSTS_SECONDS = 60
SECURE_HSTS_INCLUDE_SUBDOMAINS = True
SECURE_FRAME_DENY = True
SECURE_CONTENT_TYPE_NOSNIFF = True
SECURE_BROWSER_XSS_FILTER = True
SESSION_COOKIE_SECURE = True
SESSION_COOKIE_HTTPONLY = True

and

MIDDLEWARE_CLASSES = (
# This middleware is for ensuring that all pages use https
'djangosecure.middleware.SecurityMiddleware',
...

and

INSTALLED_APPS = (
# for https
'djangosecure',
...

When I run python manage.py checksecure, the message I get is 'All clear!`, however, when I deploy to google apps engine, I get this error:

File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/django-    1.5/django/core/handlers/base.py", line 51, in load_middleware
raise exceptions.ImproperlyConfigured('Error importing middleware %s: "%s"' %   (mw_module, e))
ImproperlyConfigured: Error importing middleware django-secure-    1.0.1.djangosecure.middleware: "No module named django-secure-   1.0.1.djangosecure.middleware"

What am I doing wrong?