(...)
  File "/usr/local/conda/lib/python2.7/site-packages/requests/sessions.py", line 535, in post
    return self.request('POST', url, data=data, json=json, **kwargs)
  File "/usr/local/conda/lib/python2.7/site-packages/requests/sessions.py", line 488, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/local/conda/lib/python2.7/site-packages/requests/sessions.py", line 609, in send
    r = adapter.send(request, **kwargs)
  File "/usr/local/conda/lib/python2.7/site-packages/requests/adapters.py", line 423, in send
    timeout=timeout
  File "/usr/local/conda/lib/python2.7/site-packages/requests/packages/urllib3/connectionpool.py", line 594, in urlopen
    chunked=chunked)
  File "/usr/local/conda/lib/python2.7/site-packages/requests/packages/urllib3/connectionpool.py", line 350, in _make_request
    self._validate_conn(conn)
  File "/usr/local/conda/lib/python2.7/site-packages/requests/packages/urllib3/connectionpool.py", line 835, in _validate_conn
    conn.connect()
  File "/usr/local/conda/lib/python2.7/site-packages/requests/packages/urllib3/connection.py", line 323, in connect
    ssl_context=context)
  File "/usr/local/conda/lib/python2.7/site-packages/requests/packages/urllib3/util/ssl_.py", line 322, in ssl_wrap_socket
    context.load_cert_chain(certfile, keyfile)
  File "/usr/local/conda/lib/python2.7/site-packages/requests/packages/urllib3/contrib/pyopenssl.py", line 397, in load_cert_chain
    self._ctx.use_certificate_file(certfile)
  File "/usr/local/conda/lib/python2.7/site-packages/OpenSSL/SSL.py", line 596, in use_certificate_file
    _raise_current_error()
  File "/usr/local/conda/lib/python2.7/site-packages/OpenSSL/_util.py", line 48, in exception_from_error_queue
    raise exception_type(errors)
OpenSSL.SSL.Error: [('system library', 'fopen', 'No such file or directory'), ('BIO routines', 'FILE_CTRL', 'system lib'), ('SSL routines', 'SSL_CTX_use_certificate_file', 'system lib')]