I've upgraded an install from 1.5.5 to 1.6.6, the upgrade went fine fine

I now encounter an issue with post-review (which I also updated), the
command is outputing this:

>>> Got HTTP error: 500:

... (html of error 500 from reviewboard)

Error creating review request: HTTP 500

on the server error log, I can find this stack trace:

ERROR:django.request:Internal Server Error: /api/review-requests/3777/draft/
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py",
line 117, in get_response
    response = middleware_method(request, e)
line 220, in process_exception
    request.user, request.build_absolute_uri(),
  File "/usr/lib/python2.7/site-packages/django/contrib/auth/middleware.py",
line 9, in __get__
    request._cached_user = get_user(request)
  File "/usr/lib/python2.7/site-packages/django/contrib/auth/__init__.py",
line 109, in get_user
    backend = load_backend(backend_path)
  File "/usr/lib/python2.7/site-packages/django/contrib/auth/__init__.py",
line 23, in load_backend
    raise ImproperlyConfigured('Module "%s" does not define a "%s"
authentication backend' % (module, attr))
ImproperlyConfigured: Module "reviewboard.accounts.backends" does not
define a "StandardAuthBackend" authentication backend

I run post-review this way:

c:\python27\scripts\post-review --server=servername
--revision-range=... --repository-url=... --debug --username=...
--password=... --publish --target-groups=... --summary=...

The post-review command is failing when ran by SYSTEM account on a
windows box, it works when I run it from a user session, is there
anything I should look at regarding authentification or any idea how
to fix the issue described in server error log?

I went to the administration settings / authentication page and saved
the settings so authentication method is "Standard Registration", but
I'm still encountering the issue

Thanks for your help

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