ruby-on-rails – bootstrap：导入的文件未找到或不可读

我正在关注http://ruby.railstutorial.org/chapters/filling-in-the-layout#fnref-5_5教程,并在app / assets / stylesheets / custom.css.scss中导入引导程序.

那是我的Gemfile：

source 'https://rubygems.org'
gem 'bootstrap-sass','2.0.4'
gem 'rails','3.2.8'

group :development,:test do
gem 'sqlite3','1.3.5'
gem 'rspec-rails','2.11.0'
end

Gems used only for assets and not required
in production environments by default.
group :assets do
gem 'sass-rails','3.2.5'
gem 'coffee-rails','3.2.2'
gem 'uglifier','1.2.3'
end

gem 'jquery-rails','2.0.2'

group :test do
gem 'capybara','1.1.2'
end

group :production do
gem 'pg','0.12.2'
end

我在localhost / sample_app / home上遇到了什么错误

Sass::SyntaxError in Static_pages#home

Showing c:/Users/katja/Arbeit/rails_projects/sample_app/app/views/layouts/application.html.erb where line #5 raised:

File to import not found or unreadable: bootstrap.
Load path: Sass::Rails::Importer(c:/Users/katja/Arbeit/rails_projects/sample_app/app/assets/stylesheets/custom.css.scss)
(in c:/Users/katja/Arbeit/rails_projects/sample_app/app/assets/stylesheets/custom.css.scss)
Extracted source (around line #5):

2: 
3:

4: <%= full_title(yield(:title)) %>
5: <%= stylesheet_link_tag "application",media: "all" %>
6: <%= javascript_include_tag "application" %>
7: <%= csrf_meta_tags %>
8: <!--[if lt IE 9]>
Rails.root: c:/Users/katja/Arbeit/rails_projects/sample_app
Application Trace | Framework Trace | Full Trace
app/assets/stylesheets/custom.css.scss:1
app/views/layouts/application.html.erb:5:in `app_views_layouts_application_html_erb_16020705_20168520'

我正在使用Windows和GitBash.我已经尝试删除tmp / cache,它没有帮助.
一切都运行得很完美,但是当我添加@import“bootstrap”时;到cusom.css.scss,我收到一个错误.