尝试加载gem“uglifier”时发生错误。 （捆扎机:: GemRequireError）
为什么我得到这个错误？
shibly@mybox:~/blog$ rails server /home/shibly/.gem/ruby/2.2.4/gems/bundler-1.11.2/lib/bundler/runtime.rb:80:in `rescue in block (2 levels) in require': There was an error while trying to load the gem 'uglifier'. (Bundler::GemRequireError) from /home/shibly/.gem/ruby/2.2.4/gems/bundler-1.11.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require' from /home/shibly/.gem/ruby/2.2.4/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in `each' from /home/shibly/.gem/ruby/2.2.4/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in `block in require' from /home/shibly/.gem/ruby/2.2.4/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in `each' from /home/shibly/.gem/ruby/2.2.4/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in `require' from /home/shibly/.gem/ruby/2.2.4/gems/bundler-1.11.2/lib/bundler.rb:99:in `require' from /home/shibly/blog/config/application.rb:7:in `<top (required)>' from /home/shibly/.gem/ruby/2.2.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:78:in `require' from /home/shibly/.gem/ruby/2.2.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:78:in `block in server' from /home/shibly/.gem/ruby/2.2.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:75:in `tap' from /home/shibly/.gem/ruby/2.2.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:75:in `server' from /home/shibly/.gem/ruby/2.2.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:39:in `run_command!' from /home/shibly/.gem/ruby/2.2.4/gems/railties-4.2.5/lib/rails/commands.rb:17:in `<top (required)>' from bin/rails:9:in `require' from bin/rails:9:in `<main> 您应该运行以下命令在Ubuntu中安装NodeJS
sudo apt-get install nodejs
或者运行这个OSX
brew install nodejs
Uglifier是一个JS包装，它需要一个JS运行时运行或JS解释器。 我会select安装NodeJS。
在默认的Rails Gemfile中，gem'therubyracer'的行被注释掉了。 如果你取消注释，你会得到那个gem，它应该工作。
从“ 开始使用Rails ”：
编译CoffeeScript和JavaScript资产压缩需要您的系统上有可用的JavaScript运行时，如果没有运行时，您将在资产编译期间看到
execjs错误。 通常Mac OS X和Windows都会安装一个JavaScript运行库。 Rails将生成的Gemfile中的therubyracergem添加到新应用程序的注释行中，如果需要，可以取消注释。therubyrhino是JRuby用户的推荐运行时间，默认添加到JRuby下生成的应用程序的Gemfile中。 您可以调查ExecJS上的所有受支持的运行时。
我认为它需要JS运行时。 尝试安装nodejs 。
创build数据库时出错。
问题是Node.js试图在脚本中没有sudo的情况下安装：
sudo apt-get install nodejs
