以下は必須となります。 gem 'therubyracer', platforms: :ruby(有効化) gem 'less-rails' (追記) gem 'twitter-bootstrap-rails'(追記) source 'https://rubygems.org' # Bundle edge Rails instead: gem 'rails', github: 'rails/rails' gem 'rails', '4.1.7' # Use sqlite3 as the database for Active Record gem 'sqlite3' # Use SCSS for stylesheets gem 'sass-rails', '~> 4.0.0' # Use Uglifier as compressor for JavaScript assets gem 'u