builtins.ValueError
ValueError: astimezone() cannot be applied to a naive datetime

Traceback (most recent call last)
File "/usr/lib/python3.4/site-packages/flask/app.py", line 2309, in __call__
return self.wsgi_app(environ, start_response)
File "/usr/lib/python3.4/site-packages/flask/app.py", line 2295, in wsgi_app
response = self.handle_exception(e)
File "/usr/lib/python3.4/site-packages/flask/app.py", line 1741, in handle_exception
reraise(exc_type, exc_value, tb)
File "/usr/lib/python3.4/site-packages/flask/_compat.py", line 35, in reraise
raise value
File "/usr/lib/python3.4/site-packages/flask/app.py", line 2292, in wsgi_app
response = self.full_dispatch_request()
File "/usr/lib/python3.4/site-packages/flask/app.py", line 1815, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/lib/python3.4/site-packages/flask/app.py", line 1718, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/lib/python3.4/site-packages/flask/_compat.py", line 35, in reraise
raise value
File "/usr/lib/python3.4/site-packages/flask/app.py", line 1813, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/lib/python3.4/site-packages/flask/app.py", line 1799, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/vagrant/NERDweb/nerd_main.py", line 644, in ips
return render_template('ips.html', json=json, ctrydata=ctrydata, **locals())
File "/vagrant/NERDweb/nerd_main.py", line 273, in render_template
return flask.render_template(template, config=config, config_tags=config_tags['tags'], userdb=userdb, user=g.user, ac=g.ac, **kwargs)
File "/usr/lib/python3.4/site-packages/flask/templating.py", line 135, in render_template
context, ctx.app)
File "/usr/lib/python3.4/site-packages/flask/templating.py", line 117, in _render
rv = template.render(context)
File "/usr/lib/python3.4/site-packages/jinja2/environment.py", line 1008, in render
return self.environment.handle_exception(exc_info, True)
File "/usr/lib/python3.4/site-packages/jinja2/environment.py", line 780, in handle_exception
reraise(exc_type, exc_value, tb)
File "/usr/lib/python3.4/site-packages/jinja2/_compat.py", line 37, in reraise
raise value.with_traceback(tb)
File "/vagrant/NERDweb/templates/ips.html", line 1, in top-level template code
{% extends "layout.html" %}
File "/vagrant/NERDweb/templates/layout.html", line 181, in top-level template code
{% block body %}{% endblock %}
File "/vagrant/NERDweb/templates/ips.html", line 156, in block "body"
<td class="time">{{ip.ts_added.astimezone(timezone).strftime("%Y-%m-%d %H:%M:%S")}}</td>
ValueError: astimezone() cannot be applied to a naive datetime