Rails 4.1.6找不到生成器引导程序：install

Question

我收到消息找不到生成器引导程序：在Rails 4.1.6上安装

我的宝石文件如下所示：

source 'https://rubygems.org'


 # Bundle edge Rails instead: gem 'rails'

gem 'rails', '4.1.6'

 # Use postgresql as the database for Active Record

gem 'pg'

 # Use SCSS for stylesheets

gem 'sass-rails'

 # Use Uglifier as compressor for JavaScript assets

gem 'uglifier', '>= 1.3.0'

 # Use CoffeeScript for .js.coffee assets and views

gem 'coffee-rails', '~> 4.0.0'

 # Use jquery as the JavaScript library

gem 'jquery-rails'

 # Turbolinks makes following links in your web application faster.

gem 'turbolinks'

 # Build JSON APIs with ease.

gem 'jbuilder', '~> 2.0'

 # bundle exec rake doc:rails generates the API under doc/api.

gem 'sdoc', '~> 0.4.0',          group: :doc

 # Spring speeds up development by keeping your application running in the background.

gem 'spring',        group: :development

gem 'devise'

gem "therubyracer"

gem "less-rails"  #Sprockets (what Rails 3.1 uses for its asset pipeline) supports LESS

# twitter bootstrap css & javascript toolkit

gem 'twitter-bootstrap-rails', :git => 'git://github.com/seyhunak/twitter-bootstrap-rails.git'

# twitter bootstrap css & javascript toolkit

gem 'twitter-bootswatch-rails', '~> 3.2.0'

# twitter bootstrap helpers gem, e.g., alerts etc...

gem 'twitter-bootswatch-rails-helpers'

twitter-bootstrap-rails版本是3.2.0

therubyracer版本为0.12.1

execjs版本是2.2.2

当我运行rails generate bootstrap：在命令行中安装较少时，我收到上述错误。我不明白我做错了什么。