Traceback (most recent call last):
File "/usr/local/lib/python2.6/dist-packages/tornado-3.2-py2.6-linux-x86_64.egg/tornado/
web.py", line 1218, in _when_complete
callback()
File "/usr/local/lib/python2.6/dist-packages/tornado-3.2-py2.6-linux-x86_64.egg/tornado/
web.py", line 1239, in _execute_method
self._when_complete(method(*self.path_args, **self.path_kwargs),
File "./website/handlers/
topic.py", line 113, in get
return self.render('topic/topic.html', **pars)
File "/usr/local/lib/python2.6/dist-packages/tornado-3.2-py2.6-linux-x86_64.egg/tornado/
web.py", line 615, in render
html = self.render_string(template_name, **kwargs)
File "/usr/local/lib/python2.6/dist-packages/tornado-3.2-py2.6-linux-x86_64.egg/tornado/
web.py", line 722, in render_string
return t.generate(**namespace)
File "/usr/local/lib/python2.6/dist-packages/tornado-3.2-py2.6-linux-x86_64.egg/tornado/
template.py", line 278, in generate
return execute()
File "topic/
topic_html.generated.py", line 141, in _tt_execute
_tt_tmp = static_url(reply.avatar) # topic/topic.html:86 (via base.html:13)
File "/usr/local/lib/python2.6/dist-packages/tornado-3.2-py2.6-linux-x86_64.egg/tornado/
web.py", line 1108, in static_url
return base + get_url(self.settings, path, **kwargs)
File "/usr/local/lib/python2.6/dist-packages/tornado-3.2-py2.6-linux-x86_64.egg/tornado/
web.py", line 2198, in make_static_url
url = settings.get('static_url_prefix', '/static/') + path
TypeError: cannot concatenate 'str' and 'NoneType' objects