Hiera cannot find datadir

I have a working puppet 2016.2.1 using code manager (r10k) and environments (dev, staging, prod). This is working great. I than started to utilize hiera. When setting the hiera.yaml (as shown below). I'm getting the error "Cannot find datafile /etc/puppetlabs/code/environments*//*hieradata/common.yaml, skipping"

#################################

---

:backends:

  - yaml

:hierarchy:

  - "nodes/%{::trusted.certname}"

  - "%{environment}"

  - "puppet_role/%{puppet_role}"  

  - common

:yaml:

:datadir: "/etc/puppetlabs/code/environments/%{::environment}/hieradata"

#############################################################

I notice the double backslash which is a problem. If I replace the environment variable with an actual environment name (e.g. :datadir: "/etc/puppetlabs/code/environments/development/hieradata") and run hiera --debug i get back results. Has anyone run into this?