当我尝试通过 rails g bootstrap:install 安装它时添加“bootstrap-sass”后，我收到以下消息。“找不到生成器引导程序：安装”
我错过了什么吗？谢谢
我的Gemfile如下：
source 'https://rubygems.org'
gem 'rails', '4.0.0'
gem 'sqlite3'
gem 'sass-rails', '~> 4.0.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.0.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 1.2'
group :doc do
gem 'sdoc', require: false
end
gem "rspec-rails", :group => [:development, :test]
gem "database_cleaner", :group => :test
gem "email_spec", :group => :test
gem "cucumber-rails", :group => :test, :require => false
gem "launchy", :group => :test
gem "capybara", :group => :test
gem "factory_girl_rails", :group => [:development, :test]
gem "devise"
gem "quiet_assets", :group => :development
gem "figaro", ">= 0.5.3"
gem "better_errors", :group => :development
gem "binding_of_caller", :group => :development
gem 'bootstrap-sass'