Concat missing?

[nlsrchtr]

I'm getting the following error:
Error: Could not find dependent Exec[concat_/etc/bind/named.conf] for File[/var/lib/puppet/concat/_etc_bind_named.conf/fragments/ 50_bind-include-zone-example.com]

when I try to add a bind::zone. The concat module is available in the modules folder.

What am I missing?

Thanks for your help.