IOError: [Errno socket error] [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:726)

  File "/Users/david/Documents/mozilla-unified/tools/tryselect/mach_commands.py", line 142, in try_fuzzy
    return run_fuzzy_try(**kwargs)
  File "/Users/david/Documents/mozilla-unified/tools/tryselect/selectors/fuzzy.py", line 225, in run_fuzzy_try
    all_tasks = generate_tasks(parameters, full, root=vcs.path)
  File "/Users/david/Documents/mozilla-unified/tools/tryselect/tasks.py", line 66, in generate_tasks
    params = load_parameters_file(params, strict=False)
  File "/Users/david/Documents/mozilla-unified/taskcluster/taskgraph/parameters.py", line 199, in load_parameters_file
    f = urllib.urlopen(filename)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 87, in urlopen
    return opener.open(url)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 213, in open
    return getattr(self, name)(url)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 443, in open_https
    h.endheaders(data)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 1038, in endheaders
    self._send_output(message_body)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 882, in _send_output
    self.send(msg)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 844, in send
    self.connect()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 1263, in connect
    server_hostname=server_hostname)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py", line 369, in wrap_socket
    _context=self)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py", line 617, in __init__
    self.do_handshake()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py", line 846, in do_handshake
    self._sslobj.do_handshake()