psick: CI role doesn't work out of the box

I have an EC2 instance connecting to my new FOSS smaster. I’m using the CI role as an example, and I get:

root@puppetagent:/home/ubuntu# FACTER_role=ci puppet agent --test
Info: Using configured environment 'production'
Info: Retrieving pluginfacts
Info: Retrieving plugin
Info: Loading facts
Error: Could not retrieve catalog from remote server: Error 500 on SERVER: Server Error: Value for key 'psick::profiles::linux_classes', returned from lookup_key function 'eyaml_lookup_key', when using location '/etc/puppetlabs/code/environments/production/hieradata/role/ci.yaml', has wrong type, expects Puppet::LookupValue, got Hash[Enum['gitlab', 'jenkins'], Runtime[ruby, 'Symbol'], 2, 2] on node puppetagent.sandbox.MUNGED.com
Warning: Not using cache on failed catalog
Error: Could not retrieve catalog; skipping run

Any clues?