url build error when sending out trade request emails

File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/celery/app/trace.py", line 240, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/Users/Sohail/PycharmProjects/smtrade/app/celery_creator.py", line 22, in __call__
    return super(ContextTask, self).__call__(*args, **kwargs)
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/celery/app/trace.py", line 438, in __protected_call__
    return self.run(*args, **kwargs)
  File "/Users/Sohail/PycharmProjects/smtrade/util/emailing.py", line 25, in send_mail
    msg.html = render_template(template + '.html', **kwargs)
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/flask/templating.py", line 128, in render_template
    context, ctx.app)
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/flask/templating.py", line 110, in _render
    rv = template.render(context)
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/jinja2/environment.py", line 989, in render
    return self.environment.handle_exception(exc_info, True)
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/jinja2/environment.py", line 754, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/jinja2/_compat.py", line 37, in reraise
    raise value.with_traceback(tb)
  File "/Users/Sohail/PycharmProjects/smtrade/templates/emails/trade_requested.html", line 1, in top-level template code
    {% extends 'base.html' %}
  File "/Users/Sohail/PycharmProjects/smtrade/templates/base.html", line 2, in top-level template code
    {% import "util.html" as util %}
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/flask_bootstrap/templates/bootstrap/base.html", line 1, in top-level template code
    {% block doc -%}
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/flask_bootstrap/templates/bootstrap/base.html", line 4, in block "doc"
    {%- block html %}
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/flask_bootstrap/templates/bootstrap/base.html", line 20, in block "html"
    {% block body -%}
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/flask_bootstrap/templates/bootstrap/base.html", line 23, in block "body"
    {% block content -%}
  File "/Users/Sohail/PycharmProjects/smtrade/templates/base.html", line 50, in block "content"
    {% block page_content %}
  File "/Users/Sohail/PycharmProjects/smtrade/templates/emails/trade_requested.html", line 9, in block "page_content"
    <h3><a href="{{ url_for('auth.login') }}">Login</a> to your account to check it out!</h3>
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/flask/helpers.py", line 312, in url_for
    return appctx.app.handle_url_build_error(error, endpoint, values)
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/flask/app.py", line 1641, in handle_url_build_error
    reraise(exc_type, exc_value, tb)
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/flask/helpers.py", line 305, in url_for
    force_external=external)
  File "/Users/Sohail/.virtualenvs/smtrade/lib/python3.5/site-packages/werkzeug/routing.py", line 1758, in build
    raise BuildError(endpoint, values, method, self)
werkzeug.routing.BuildError: Could not build url for endpoint 'auth.login'.
sohail288 / sheetswap

url build error when sending out trade request emails #59
