Werkzeug Internal Server Error

traceback.txt

Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/flask/app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/local/lib/python3.4/dist-packages/flask/app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/usr/local/lib/python3.4/dist-packages/flask/app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.4/dist-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/usr/local/lib/python3.4/dist-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.4/dist-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.4/dist-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.4/dist-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/usr/local/lib/python3.4/dist-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.4/dist-packages/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/philip/Applications and utilities/Numbas-analyser/server.py", line 29, in inner
    return fn(*args,**kwargs)
  File "/home/philip/Applications and utilities/Numbas-analyser/server.py", line 220, in attempt_report
    return render_template('scorm/report.html',course=course,scorm=scorm,attempt=attempt)
  File "/usr/local/lib/python3.4/dist-packages/flask/templating.py", line 128, in render_template
    context, ctx.app)
  File "/usr/local/lib/python3.4/dist-packages/flask/templating.py", line 110, in _render
    rv = template.render(context)
  File "/usr/local/lib/python3.4/dist-packages/jinja2/environment.py", line 989, in render
    return self.environment.handle_exception(exc_info, True)
  File "/usr/local/lib/python3.4/dist-packages/jinja2/environment.py", line 754, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.4/dist-packages/jinja2/_compat.py", line 37, in reraise
    raise value.with_traceback(tb)
  File "/home/philip/Applications and utilities/Numbas-analyser/templates/scorm/report.html", line 1, in top-level template code
    {% extends "scorm/base.html" %}
  File "/home/philip/Applications and utilities/Numbas-analyser/templates/scorm/base.html", line 1, in top-level template code
    {% extends "course/base.html" %}
  File "/home/philip/Applications and utilities/Numbas-analyser/templates/course/base.html", line 1, in top-level template code
    {% extends "base.html" %}
  File "/home/philip/Applications and utilities/Numbas-analyser/templates/base.html", line 86, in top-level template code
    {% block content %}{% endblock content %}
  File "/home/philip/Applications and utilities/Numbas-analyser/templates/course/base.html", line 12, in block "content"
    {% block coursecontent %}{% endblock coursecontent %}
  File "/home/philip/Applications and utilities/Numbas-analyser/templates/scorm/base.html", line 12, in block "coursecontent"
    {% block scormcontent %}{% endblock scormcontent %}
  File "/home/philip/Applications and utilities/Numbas-analyser/templates/scorm/report.html", line 119, in block "scormcontent"
    <td class="score raw {{(objective.raw_score/objective.max_score)|correctstyle}}">{{objective.raw_score}}</td>
ZeroDivisionError: float division by zero