ERB template does not collect variables from hieradata

I have a puppet infrastructure and I created a new module that references the variables that exist in the hamadata yaml files that everything works fine in the manifest section. However, when I access them in the erb template, the variables do not display anything after the puppet rus. There is a file, just variables ..

init.pp

class cms_nxlog ($msi_file) {
    anchor { 'cms_nxlog::begin': }
->
file { "C:/CMS/${cms_nxlog::msi_file}":
    ensure      =>  'file',
    source      =>  "puppet:///modules/cms_nxlog/${cms_nxlog::msi_file}",
    owner       => 'Administrators',
    group       => 'Users',
    mode        => '0770'

}
->
package { 'NXLOG-CE':
    ensure      =>  installed ,
    source      =>  "C:\\CMS\\${cms_nxlog::msi_file}",
}
->
file { "C:/Program Files (x86)/nxlog/conf/nxlog.conf":
    ensure      => 'file',
    content      => template('cms_nxlog/nxlog.conf.erb'),
    owner       => 'Administrators',
    group       => 'Users',
    mode        => '0770',
    notify      => Service['nxlog'],
}
->
service { 'nxlog' :
    ensure      =>  'running',
    require     => Package['NXLOG-CE']
}
->
    anchor { 'cms_nxlog::end': }
}

      

        
        
        
      

    

Relevant section of the erb template:

<Output out>
Module om_udp
   Host <%= scope.lookupvar('cms::log_server') %>
   Port <%= scope.lookupvar('cms_nxlog::port') %>
</Output>

      

        
        
        
      

    

Relevant yaml sections

cms_nxlog::msi_file:               nxlog-ce-2.8.1248.msi
cms_nxlog::port:                   514
cms::log_server:              192.168.1.50

      

        
        
        
      

    

This all fits perfectly, just copying the erb doesn't seem to populate the contents of the scope.lookupvar, so I end up saying

<Output out>
Module om_udp
   Host 
   Port 
</Output>

      

        
        
        
      

    

As I said, the variables seem to work fine in the manifest and not in the template. I compared this to a similar module that seems to work to no avail.

thank