Initial setup fails

[fluffy-critter]

When I try running for the first time to generate a config file:

cadet:beesbuzz.biz main$ poetry run feediverse
What is your Mastodon Instance URL? https://plush.city
Do you have your app credentials already? [y/n] n
Ok, I'll need a few things in order to get your access token
app name (e.g. feediverse): 
Traceback (most recent call last):
  File "/Users/fluffy/Library/Caches/pypoetry/virtualenvs/beesbuzz.biz-NFomSJ_p-py3.8/bin/feediverse", line 8, in <module>
    sys.exit(main())
  File "/Users/fluffy/Library/Caches/pypoetry/virtualenvs/beesbuzz.biz-NFomSJ_p-py3.8/lib/python3.8/site-packages/feediverse.py", line 49, in main
    setup(config_file)        
  File "/Users/fluffy/Library/Caches/pypoetry/virtualenvs/beesbuzz.biz-NFomSJ_p-py3.8/lib/python3.8/site-packages/feediverse.py", line 242, in setup
    client_id, client_secret = Mastodon.create_app(
  File "/Users/fluffy/Library/Caches/pypoetry/virtualenvs/beesbuzz.biz-NFomSJ_p-py3.8/lib/python3.8/site-packages/mastodon/Mastodon.py", line 280, in create_app
    return (response['client_id'], response['client_secret'])
KeyError: 'client_id'