error

ruby ./rubynotes.rb 
/home/zorak/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- green_shoes (LoadError)
	from /home/zorak/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from ./rubynotes.rb:1:in `<main>'

rubynotes.rb

require 'green_shoes'
require 'yalm/store'

Shoes.app height:200, width: 200, title: "RubyNotes app" do
  flow do
    button "New" do
    end
    button "Open" do
    end
    button "Save" do
    end
  end
end