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I've been trying to use Rails and when I use rake, I get this error. Any suggestions on which run time should I use? ngzhongqin@ngzhongqin-linux:~/RailsProjects/webuiltit$ rake db:create:all --trace rake aborted! Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/execjs-1.2.4/lib/execjs/runtimes.rb:45:in `autodetect' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/execjs-1.2.4/lib/execjs.rb:5:in `<module:ExecJS>' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/execjs-1.2.4/lib/execjs.rb:4:in `<top (required)>' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `require' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `<top (required)>' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `require' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `<top (required)>' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/coffee-rails-3.1.0/lib/coffee-rails.rb:1:in `require' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/coffee-rails-3.1.0/lib/coffee-rails.rb:1:in `<top (required)>' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.18/lib/bundler/runtime.rb:68:in `require' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.18/lib/bundler/runtime.rb:68:in `block (2 levels) in require' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.18/lib/bundler/runtime.rb:66:in `each' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.18/lib/bundler/runtime.rb:66:in `block in require' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.18/lib/bundler/runtime.rb:55:in `each' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.18/lib/bundler/runtime.rb:55:in `require' /home/ngzhongqin/.rvm/gems/ruby-1.9.2-p290/

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