Internal server error (jinja error?)

Hi community!

I had askbot running for months, but now I started getting 500 internal error. I'm stuck with the issues for days now. Please suggest if I'm missing anything (In case you recommend a re-installation, could you point me to some link which helps reinstalling askbot - keeping all my data/settings intact)

The full track-back is here,

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] mod_wsgi (pid=8580): Exception occurred processing WSGI script '/home/probaho/webapps/askbot/answers.wsgi'.

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] Traceback (most recent call last):

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] File "/home/probaho/lib/python2.6/Django-1.3.1-py2.6.egg/django/core/handlers/wsgi.py", line 272, in __call__

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] response = self.get_response(request)

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] File "/home/probaho/lib/python2.6/Django-1.3.1-py2.6.egg/django/core/handlers/base.py", line 153, in get_response

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] response = self.handle_uncaught_exception(request, resolver, sys.exc_info())

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] File "/home/probaho/lib/python2.6/Django-1.3.1-py2.6.egg/django/core/handlers/base.py", line 218, in handle_uncaught_exception

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] return callback(request, **param_dict)

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] File "/home/probaho/lib/python2.6/Django-1.3.1-py2.6.egg/django/utils/decorators.py", line 93, in _wrapped_view

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] response = view_func(request, args, *kwargs)

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] File "/home/probaho/lib/python2.6/Django-1.3.1-py2.6.egg/django/views/defaults.py", line 31, in server_error

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] return http.HttpResponseServerError(t.render(Context({})))

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] File "/home/probaho/lib/python2.6/Django-1.3.1-py2.6.egg/django/template/base.py", line 123, in render

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] return self._render(context)

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] File "/home/probaho/lib/python2.6/Django-1.3.1-py2.6.egg/django/template/base.py", line 117, in _render

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] return self.nodelist.render(context)

[Wed Jul 11 16:04:07 2012] [error] [client 127.0.0.1] File "/home/probaho/lib/python2.6/Django-1.3.1-py2.6.egg/django/template/base.py", line 744, in render

[Wed Jul 11 16:04:07 2012] [error] [client 127 ... (more)