很简单的 require‘sass’但是 load error 了

rb 文件 1 require 'sinatra' 2 require 'haml' 3 require 'sass' 4 5 configure do 6 set :haml, :format => :html5 7 set :scss, :style => :compact 8 end 9 10 get '/css/layout.css' do 11 scss :layout 12 end 13 14 get '/' do 15 haml :index 16 end

ruby *.rb 时， 出现： PeachtekiMacBook-Air:freya cain$ ruby freya.rb /Users/cain/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:110:in require': cannot load such file -- sass (LoadError) from /Users/cain/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:110:inrescue in require' from /Users/cain/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:35:in require' from freya.rb:3:in