我是RoR的新手，无法修复错误“无法找到文件'bootstrap / css / bootstrap”。
我经历了很多帖子，但没有解决我的问题。似乎有任何问题 Gem文件（需要升级或删除的东西）或application.css.scss文件找不到'bootstrap / css / bootstrap'或“_stylesheets.html.haml”调用样式表。
有人可以建议吗？
错误：
ActionView :: Template :: Error（找不到文件'bootstrap / css / bootstrap' （在/root/rails_project/res_dash/app/assets/stylesheets/custom.css.scss:11））：
1: -# CSS: implied media="all"
2: -# = stylesheet_link_tag 'compiled/screen', :media => 'all
3: = stylesheet_link_tag 'application', media: 'screen'
_stylesheets.html.haml
-# CSS: implied media="all"
-# = stylesheet_link_tag 'compiled/screen', :media => 'all'
= stylesheet_link_tag 'application', media: 'screen'
application.css.scss
*= require bootstrap/css/bootstrap
*= require bootstrap_and_overrides
*= require bootstrap/css/bootstrap-responsive
*= require font-awesome/sass/font-awesome
*= require css/style
*= require css/style_responsive
*= require css/style_default
*= require gritter/css/jquery.gritter
*= require uniform/css/uniform.default
*= require dataTables/jquery.dataTables.bootstrap
*= require dataTables/extras/TableTools
*= require dataTables/extras/TableTools_JUI
*= require bootstrap-daterangepicker/daterangepicker
*= require chosen
*= require fancybox
*= require dashboard
*= require res-layout
*= require_self
的Gemfile
gem "sass"
gem "sass-rails"
gem "haml
.
.
.
.
gem "haml-rails"
gem "compass"
gem "chosen-rails", "~> 0.12.0"
gem "therubyracer"
gem "bootstrap-sass", "2.3.2.0"
gem "twitter-bootstrap-rails"
gem "less-rails"