Puppet users - Oct 2012 - Puppet own function

Good day.

Im trying to make my own function. I keep getting this message.

err: Could not retrieve catalog from remote server: Error 400 on SERVER:
Function ''brent_k'' does not return a value at
/etc/puppet/modules/munin/manifests/init.pp:17 on node XYZ.com

Here is my simple code

xyz.com:/etc/puppet/modules/munin/lib/puppet/parser/functions# cat brent_k.rb
   module Puppet::Parser::Functions
     newfunction(:brent_k, :type => :rvalue) do |args|
       val = ''ok''
       val
     end
   end

And then in my manifest, I have

    $a = brent_k()

I tried "return val" too.

Thanks if you can help
Brent

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