Spotify authentication doesn't work

Hey, not sure if I'm configuring stuff correctly, but in the Spotify app, I've set the redirect URL to localhost:8080.

When I run spotify_to_ytmusic commands that require Spotify auth, the browser opens first a Spotify login page, and after signing in redirects to a page that says INVALID_CLIENT: Invalid redirect URI. That page has a URL that looks like this:

https://accounts.spotify.com/authorize?scope=user-library-read&response_type=code&flow_ctx={{a uuid}}%3A{{a unix timestamp}}&redirect_uri=http%3A%2F%2Flocalhost&client_id={{the client id}}

Pasting that URL back into spotify_to_ytmusic does not work:

Could not get Spotify playlist. Please check the playlist link.
 Error: SpotifyOauthError('error: invalid_request, error_description: code must be supplied')
Traceback (most recent call last):
  File "/opt/homebrew/bin/spotify_to_ytmusic", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/opt/homebrew/lib/python3.11/site-packages/spotify_to_ytmusic/main.py", line 86, in main
    args.func(args)
  File "/opt/homebrew/lib/python3.11/site-packages/spotify_to_ytmusic/controllers.py", line 71, in create
    _create_ytmusic(args, playlist, ytmusic)
  File "/opt/homebrew/lib/python3.11/site-packages/spotify_to_ytmusic/controllers.py", line 58, in _create_ytmusic
    name = args.name + date if args.name else playlist["name"] + date
                                              ~~~~~~~~^^^^^^^^
TypeError: 'NoneType' object is not subscriptable

sigma67 / spotify_to_ytmusic

Spotify authentication doesn't work #74