500 Internal Server Error => it is normal

[wardbeyens]

500 Internal Server Error
The server encountered an unexpected condition which prevented it from fulfilling the request.

Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/cherrypy/_cprequest.py", line 628, in respond
    self._do_respond(path_info)
  File "/usr/local/lib/python3.5/dist-packages/cherrypy/_cprequest.py", line 687, in _do_respond
    response.body = self.handler()
  File "/usr/local/lib/python3.5/dist-packages/cherrypy/lib/encoding.py", line 219, in __call__
    self.body = self.oldhandler(*args, **kwargs)
  File "/usr/local/lib/python3.5/dist-packages/cherrypy/_cpdispatch.py", line 54, in __call__
    return self.callable(*self.args, **self.kwargs)
  File "/oauth.py", line 46, in token
    self.oauth2.fetch_token(self.user_data['token_uri'], client_secret=self.user_data['client_secret'], code=token)
  File "/usr/local/lib/python3.5/dist-packages/requests_oauthlib/oauth2_session.py", line 307, in fetch_token
    self._client.parse_request_body_response(r.text, scope=self.scope)
  File "/usr/local/lib/python3.5/dist-packages/oauthlib/oauth2/rfc6749/clients/base.py", line 415, in parse_request_body_response
    self.token = parse_token_response(body, scope=scope)
  File "/usr/local/lib/python3.5/dist-packages/oauthlib/oauth2/rfc6749/parameters.py", line 425, in parse_token_response
    validate_token_parameters(params)
  File "/usr/local/lib/python3.5/dist-packages/oauthlib/oauth2/rfc6749/parameters.py", line 432, in validate_token_parameters
    raise_from_error(params.get('error'), params)
  File "/usr/local/lib/python3.5/dist-packages/oauthlib/oauth2/rfc6749/errors.py", line 405, in raise_from_error
    raise cls(**kwargs)
oauthlib.oauth2.rfc6749.errors.InvalidGrantError: (invalid_grant) Bad Request
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[wardbeyens]

RTFM