When using the Diviner action Edit Book on freshly generated Phabricator books an exception appears:

Unhandled Exception ("Exception")
Unable to resolve method 'describeAutomaticCapability'.

Versions:

Reproduction steps:

• generate Phabricator books as suggested when you enter the Diviner application for the first time.
• select a book (we used Phabricator Contributor Documentation) and select the Edit-Button from the Actions menu.

The resulting screen shows:

Note:
This looks pretty much like a common problem, but I didn't find any existing reports so far.