404 on /data.jsonld and internal server error on /pod/validate (wrong param count for do_validation())

[lsattem]

Ckan version: 2.9.a
Python version: 2.7.12

I installed the plugin according to the readme, but I'm getting a 404 on /data.jsonld, and an error on the /pod/validate page.

On /pod/validate I get the following error:

Internal error
Something bad happened: do_validation() takes exactly 3 arguments (2 given)

There's no log output in any file in the the /var/log/apache2/ directory, and I don't know where else I might find logs from the datajson extension.

The /data.json path works fine.