mcollective não consegue encontrar puppet ddl, embora exista

Question

[vagrant@puppetserver ~]$ ls /usr/libexec/mcollective/mcollective/agent/
filemgr.ddl  nettest.ddl  package.ddl  puppet.ddl  service.ddl
filemgr.rb   nettest.rb   package.rb   puppet.rb   service.rb

[vagrant@puppetserver ~]$ mco rpc puppet runonce -v

The rpc application failed to run: Can't find DDL for agent plugin 'puppet'

Can't find DDL for agent plugin 'puppet' (RuntimeError)
        from /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/mcollective/ddl/base.rb:83:in 'loadddlfile'  <----

Todos os pacotes necessários estão instalados, eu acho.

Package mcollective-puppet-agent-1.11.1-1.el7.noarch already installed and latest version
Package mcollective-puppet-client-1.11.1-1.el7.noarch already installed and latest version
Package mcollective-puppet-common-1.11.1-1.el7.noarch already installed and latest version
Nothing to do

Mais fatos parecem estar funcionando de maneira inadequada.

[vagrant@puppetserver ~]$ mco facts hostname
No values found for fact hostname

Finished processing 2 / 2 hosts in 42.06 ms

Mas posso pingar todos esses nós.

[vagrant@puppetserver ~]$ mco ping
puppetserver.example.com                 time=10.54 ms
client.example.com                       time=49.43 ms

O plugin Puppet não é visível no inventário do nó.

Agents:
      discovery       rpcutil

   Data Plugins:
      agent           collective      fact
      fstat

Como posso corrigir este problema?