using Barby in rails

Hello im trying to add some barcode generation funcionality to my app, all via barby gem.

I'm building a custom helper, but i cant include barby module to load, when i write

module BarcodeHelper   include Barby end

i receive error: Routing Error uninitialized constant BarcodeHelper::Barby Try running rake routes for more information on available routes.

and i change it to: module BarcodeHelper   #include Barby   require 'barby' end

i receive: Missing helper file helpers/barby.rb

how it should be done? im using rails 3.2