rake asset：预编译中止，无法推送到heroku

我正在使用 Enki 博客 gem，它在本地工作，尝试准备推送到 heroku（以前从未遇到过问题）。我尝试预编译，它做到了这一点

/Users/me/.rvm/rubies/ruby-1.9.3-rc1/bin/ruby /Users/me/.rvm/gems/ruby-1.9.3-rc1@ruby193/bin/rake assets:precompile:all RAILS_ENV=production RAILS_GROUPS=assets
rake aborted!
cannot load such file -- uglifier
  (in /Users/me/Sites/bayani/app/assets/javascripts/admin.js)

我以前在将 Enki 博客推送到 Heroku 时从未遇到过麻烦，虽然我不知道 uglifier 在哪里，但我记得在我推送的其他 Enki 博客中看到过它，所以我不知道为什么它现在会产生问题。

当我推送到 Heroku 时，它也中止了预编译

Preparing app for Rails asset pipeline
       Running: rake assets:precompile
       rake aborted!
       no such file to load -- uglifier
       (in /tmp/build_5tbsi7k7ddhk/app/assets/javascripts/admin.js)
       Tasks: TOP => assets:precompile:primary
       (See full trace by running task with --trace)
       Precompiling assets failed, enabling runtime asset compilation
       Injecting rails31_enable_runtime_asset_compilation
       Please see this article for troubleshooting help:
       http://devcenter.heroku.com/articles/rails31_heroku_cedar#troubleshooting

在阅读了其提供的链接中的故障排除文章后，我将其放入 application.rb 中

config.assets.initialize_on_precompile = false

但我仍然遇到同样的问题

这是admin.js。这只是一个清单文件。这是 enki 的链接https://github.com/xaviershay/enki https://github.com/xaviershay/enki

// This is a manifest file that'll be compiled into application.js, which will include all the files
// listed below.
//
// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
// or vendor/assets/javascripts of plugins, if any, can be referenced here using a relative path.
//
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// the compiled file.
//
// WARNING: THE FIRST BLANK LINE MARKS THE END OF WHAT'S TO BE PROCESSED, ANY BLANK LINE SHOULD
// GO AFTER THE REQUIRES BELOW.
//
//= require jquery
//= require jquery_ujs
//= require jquery.livequery
//= require jquery.form
//= require jquery.easing.1.3
//= require humanmsg
//= require_tree ./admin

将以下内容添加到 Gemfile 中。

group :assets do
  gem 'therubyracer'
  gem 'sass-rails', "  ~> 3.1.0"
  gem 'coffee-rails', "~> 3.1.0"
  gem 'uglifier'
end

Run

捆绑安装

抓取资产：预编译

我希望，它会有用。