Ruby on rails 4 引导sass出错。迁移到Rails 4

我正在尝试从rails 3.2迁移到rails 4.0.1，当我按照本指南完成所有工作时

我有错误的引导css

    File to import not found or unreadable: bootstrap-responsive.
Load paths:
  /home/arseniy/Work/requests/app/assets/images
  /home/arseniy/Work/requests/app/assets/javascripts
  /home/arseniy/Work/requests/app/assets/stylesheets
  /home/arseniy/Work/requests/vendor/assets/images
  /home/arseniy/Work/requests/vendor/assets/javascripts
  /home/arseniy/Work/requests/vendor/assets/stylesheets
  /home/arseniy/.rvm/gems/ruby-2.0.0-p247@requests/gems/bootstrap-sass-3.0.2.1/vendor/assets/fonts
  /home/arseniy/.rvm/gems/ruby-2.0.0-p247@requests/gems/bootstrap-sass-3.0.2.1/vendor/assets/javascripts
  /home/arseniy/.rvm/gems/ruby-2.0.0-p247@requests/gems/bootstrap-sass-3.0.2.1/vendor/assets/stylesheets
  /home/arseniy/.rvm/gems/ruby-2.0.0-p247@requests/gems/jquery-rails-3.0.4/vendor/assets/javascripts
  /home/arseniy/.rvm/gems/ruby-2.0.0-p247@requests/gems/coffee-rails-4.0.1/lib/assets/javascripts
  /home/arseniy/.rvm/gems/ruby-2.0.0-p247@requests/gems/bootstrap-sass-3.0.2.1/vendor/assets/stylesheets
  (in /home/arseniy/Work/requests/app/assets/stylesheets/bootstrap_and_overrides.css.scss:3)

这是my bootstrap_和_overrides.css.scss

@import "bootstrap";
body { padding-top: 60px; }
@import "bootstrap-responsive";
.footer {
  text-align: right;
  color: #aaa;
}

正如Bootstrap中所解释的，现在应用“移动优先”实践。 因此，您不再需要响应css，所有必要的代码都包含在“bootstrap.css”文件中。 把你的手拿开

@import "bootstrap-responsive";

行，应该没问题