The 'API' does not work on our site - it results in errors. How can this be fixed?

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I tried to use the 'API' as described by this page:

http://askbot.org/doc/api.html#api-v1-questions

Unfortunately the only 'API' url that works is: /api/v1/info/

The others result in emails being sent with content similar to the following:

ERROR (EXTERNAL IP): Internal Server Error: /api/v1/questions/

Traceback (most recent call last):

  File "C:\Python27\lib\site-packages\django\core\handlers\base.py", line 115, in get_response
    response = callback(request, *callback_args, **callback_kwargs)

  File ".\askbot\views\api_v1.py", line 190, in questions
    datum = get_question_data(thread)

  File ".\askbot\views\api_v1.py", line 31, in get_question_data
    'added_at': thread.added_at.strftime('%s'),

ValueError: Invalid format string

Is this a known bug and how can we fix it? I am assuming this is something in the py file that is failing based on the error message

When I comment out the line that has the strftime and then retry the 'API' url, I get another error:

Server Error

500 - Internal server error.
There is a problem with the resource you are looking for, and it cannot be displayed.

It does not appear to me that this ever worked. How can this be fixed?