Puppet users - Feb 2014 - puppet custom function throwing private gsub error

I have written a small custom function to replace '.' to '_' of
all element
of an array and return an converted array.

module Puppet::Parser::Functions
  newfunction(:convert_vo, :type => :rvalue, :doc =>
<<-'ENDOFDOC'
 This function takes an array of vo and replace '.' with '_' and
return an
converted array
ENDOFDOC
  ) do |arguments|

    require 'rubygems'
    vo_list = arguments.clone
    unless vo_list.is_a?(Array)
      raise(Puppet::ParseError, 'convert_vo requires an array')
    end
    converted_vo = Array.new()
    vo_list.each do |vo|
      converted_vo.push(vo.gsub(/\./, '_'))
    end
    return converted_vo
  end
end

I am calling it like this from init.p

$vo = ['dteam', 'vo.southgrid.ac.uk']
$converted_vo = convert_vo($vo)


Puppet run on client machine fails with this error

Error: Could not retrieve catalog from remote server: Error 400 on SERVER:
private method `gsub' called for ["dteam",
"vo.southgrid.ac.uk"]:Array at
/etc/puppet/modules/voms_client/manifests/init.pp


I ran this script on client and server machines seperately and it worked
perfectly. I am not sure that what I am missing?

Thanks
Kashif

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