Puppet users - Oct 2014 - custom function error undefined local variable

I have the following custom function that I'm trying to write. 

require 'resolv'

module Puppet::Parser::Functions
  newfunction(:getIpAddr, :type => :rvalue) do |arguments|
    Resolv::DNS.open do |dns|
      ress = dns.getresources(arguments[0], Resolv::DNS::Resource::IN::A)
      if ress.any?
        dns.getaddress(arguments[0])
        #break
      else
        raise(Puppet::ParseError, "No valid A Record found for host 
#{aguments[0]}")
      end
    end
    #return value
  end
end

I'm getting the following error when I run this function. 

Error: Could not retrieve catalog from remote server: Error 400 on SERVER: 
undefined local variable or method `dns' for 
#<Puppet::Parser::Scope:0x7f5054f07110> at 


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