Have you created any of the Hiera data files (common.yaml, site/*.yaml, 
etc.)? There does not appear to be a definition of which classes to 
include. If you change hiera_include('classes') to hiera_include('classes', 
[]) the error message should go away (because [] provides a default empty 
array of classes); but you should also have something like this in your 
Hiera YAML files:

common.yaml:
---
classes:
  - ntp

>
>

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