Slice Machine failed: [slices API]: Not Found

Hallo!
Trying out the new Slice Machine tonight, but got stuck at this page in the docs:

The command

prismic sm --add-storybook

caused:

[slices API]: Not Found

Been asked to login with my credentials before that, but no luck.

Any help?

cheers
Florian

Hi Florian,

It sounds like your repository isn't on the Slicemachine group. Can you give me the URL of your repo and I'll activate this for you?

Being handled here:

Closed as being handled in another thread.