ruby on rails - Require 'barby' not working. - cannot load such file -- barby -

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i'm trying use barby gem installed, when gives me error.

loaderror cannot load such file -- barby

here's require methods in controller.

    require 'barby'     require 'barby/barcode/ean_13'     require 'barby/outputter/ascii_outputter'     require 'barby/outputter/html_outputter'      class palletscontroller < applicationcontroller     -snip-     end

here's gem in gemfile. 

gem 'barby'

any appreciated.

you add require when dealing ruby project. in case(ruby-on-rails), can remove lines.

also, keep in mind should add gems gemfile


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