"Missing code parameter in response"

[reryro]

Any idea why I would be getting this when running the unaltered quickstart.py script:

Traceback (most recent call last):
File "quickstart.py", line 71, in
main()
File "quickstart.py", line 47, in main
creds = flow.run_local_server(port=0)
File "/home/pi/.local/lib/python3.7/site-packages/google_auth_oauthlib/flow.py", line 505, in run_local_server
self.fetch_token(authorization_response=authorization_response)
File "/home/pi/.local/lib/python3.7/site-packages/google_auth_oauthlib/flow.py", line 300, in fetch_token
return self.oauth2session.fetch_token(self.client_config["token_uri"], **kwargs)
File "/home/pi/.local/lib/python3.7/site-packages/requests_oauthlib/oauth2_session.py", line 245, in fetch_token
authorization_response, state=self._state
File "/home/pi/.local/lib/python3.7/site-packages/oauthlib/oauth2/rfc6749/clients/web_application.py", line 220, in parse_request_uri_response
response = parse_authorization_code_response(uri, state=state)
File "/home/pi/.local/lib/python3.7/site-packages/oauthlib/oauth2/rfc6749/parameters.py", line 285, in parse_authorization_code_response
raise MissingCodeError("Missing code parameter in response.")
oauthlib.oauth2.rfc6749.errors.MissingCodeError: (missing_code) Missing code parameter in response.