Nested states and nested resources

I am trying to play with nested states and resources but I’m blocked when I reach the second level.

I did a sample based on the Ionic sidemenu template. I just add authors to each playlist. And I have the following states.
app.playlists: abstract (common to sub states)
app.playlists.list: display all playlists
app.playlists.edit: display a single playlist (param playlistId)
app.playlists.edit.authors: abstract
app.playlists.edit.authors.edit: display a single author (param authorId).

So when I click on an author, the URL is correct but nothing is updated on the view

The sample application is located at: