rails server error on ubuntu -


i following ruby on rails getting started guide ( http://guides.rubyonrails.org/getting_started.html ) installed ruby , rails suggested in guide when try execute: 

bin/rails server

i see following error in terminal:

warning: running `gem pristine --all` regenerate installed gemspecs (and deleting reinstalling bundle if use bundle --path) improve startup performance of spring. /var/lib/gems/2.1.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:80:in `rescue in block (2 levels) in require': there error while trying load gem 'uglifier'. (bundler::gemrequireerror) /var/lib/gems/2.1.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require' /var/lib/gems/2.1.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in `each' /var/lib/gems/2.1.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in `block in require' /var/lib/gems/2.1.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in `each' /var/lib/gems/2.1.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in `require' /var/lib/gems/2.1.0/gems/bundler-1.11.2/lib/bundler.rb:99:in `require' /home/soroosh/rails/blog/config/application.rb:7:in `<top (required)>' /var/lib/gems/2.1.0/gems/railties-4.2.5.1/lib/rails/commands/commands_tasks.rb:78:in `require' /var/lib/gems/2.1.0/gems/railties-4.2.5.1/lib/rails/commands/commands_tasks.rb:78:in `block in server' /var/lib/gems/2.1.0/gems/railties-4.2.5.1/lib/rails/commands/commands_tasks.rb:75:in `tap' /var/lib/gems/2.1.0/gems/railties-4.2.5.1/lib/rails/commands/commands_tasks.rb:75:in `server' /var/lib/gems/2.1.0/gems/railties-4.2.5.1/lib/rails/commands/commands_tasks.rb:39:in `run_command!' /var/lib/gems/2.1.0/gems/railties-4.2.5.1/lib/rails/commands.rb:17:in `<top (required)>' /home/soroosh/rails/blog/bin/rails:9:in `require' /home/soroosh/rails/blog/bin/rails:9:in `<top (required)>' /var/lib/gems/2.1.0/gems/spring-1.6.3/lib/spring/client/rails.rb:28:in `load' /var/lib/gems/2.1.0/gems/spring-1.6.3/lib/spring/client/rails.rb:28:in `call' /var/lib/gems/2.1.0/gems/spring-1.6.3/lib/spring/client/command.rb:7:in `call' /var/lib/gems/2.1.0/gems/spring-1.6.3/lib/spring/client.rb:28:in `run' /var/lib/gems/2.1.0/gems/spring-1.6.3/bin/spring:49:in `<top (required)>' /var/lib/gems/2.1.0/gems/spring-1.6.3/lib/spring/binstub.rb:11:in `load' /var/lib/gems/2.1.0/gems/spring-1.6.3/lib/spring/binstub.rb:11:in `<top (required)>' /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require' /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require' /home/soroosh/rails/blog/bin/spring:13:in `<top (required)>' bin/rails:3:in `load' bin/rails:3:in `<main>'

i using ubuntu 15.10 , ruby 2.1 , rails4.2.5.1

if closely @ error message, important line:

 there error while trying load gem 'uglifier'.

uglifier javascript wrapper, need javascript interpreter. recommend installing nodejs:

sudo apt-get install nodejs

read more uglifier: https://github.com/lautis/uglifier


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