Ruby on rails gem安装错误sass-rails

我想安装一个旧版本的

sass-rails

gem。但是我遇到了这个错误，我的css在我的项目中不起作用，请检查它：

归档

group :development, :test do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'
  gem 'uglifier',     '>= 1.0.3'
  gem 'rspec-rails'
  gem 'watchr'
end

当我运行这个命令

bundle install

时，我得到了这个错误：

$ bundle install
Your Gemfile lists the gem sass-rails (~> 3.2.3) more than once.
You should probably keep only one of them.
While it's not a problem now, it could cause errors if you change the version of just one of them later.
Your Gemfile lists the gem coffee-rails (~> 3.2.1) more than once.
You should probably keep only one of them.
While it's not a problem now, it could cause errors if you change the version of just one of them later.
Your Gemfile lists the gem uglifier (>= 1.0.3) more than once.
You should probably keep only one of them.
While it's not a problem now, it could cause errors if you change the version of just one of them later.

---

请帮我整理一下。

这只是一个警告，不是错误。gems（可能，据我们所知）安装正确，CSS的任何问题（可能）都不是由于这个警告。正如警告所说：您的Gemfile多次列出相同的gem。如果您不明白为什么或在哪里，请发布完整的Gemfile和

bundle install的完整输出？否
源代码'https://rubygems.org“
一开始还是其他什么？