title: ruby on rails uglifier error on server start up WINDOWS 10
body: <p>so im new to this and im trying to star my localhost server for rails v5 on win10 i have looked around and cant figer it out</p>
  
  <p>i put this code in`</p>
  
  <pre><code>bundler exec rails server
  </code></pre>
  
  <p>then i get this</p>
  
  <pre><code>    C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:94:in `rescue in block (2 levels) in require': There was an error while trying to load the gem 'uglifier'. (Bundler::GemRequireError)
  Gem Load Error is: Could not find a JavaScript runtime. See https://github.com/rails/execjs for a list of available runtimes.
  Backtrace for gem load error is:
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/execjs-2.7.0/lib/execjs/runtimes.rb:58:in `autodetect'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/execjs-2.7.0/lib/execjs.rb:5:in `&lt;module:ExecJS&gt;'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/execjs-2.7.0/lib/execjs.rb:4:in `&lt;top (required)&gt;'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/uglifier-3.1.13/lib/uglifier.rb:5:in `require'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/uglifier-3.1.13/lib/uglifier.rb:5:in `&lt;top (required)&gt;'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:91:in `require'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:91:in `block (2 levels) in require'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:86:in `each'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:86:in `block in require'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:75:in `each'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:75:in `require'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler.rb:107:in `require'
  C:/Sites/test_app/config/application.rb:7:in `&lt;top (required)&gt;'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:88:in `require'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:88:in `block in server'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:85:in `tap'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:85:in `server'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
  C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands.rb:18:in `&lt;top (required)&gt;'
  bin/rails:4:in `require'
  bin/rails:4:in `&lt;main&gt;'
  Bundler Error Backtrace:
          from C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:90:in `block (2 levels) in require'
          from C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:86:in `each'
          from C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:86:in `block in require'
          from C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:75:in `each'
          from C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/runtime.rb:75:in `require'
          from C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler.rb:107:in `require'
          from C:/Sites/test_app/config/application.rb:7:in `&lt;top (required)&gt;'
          from C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:88:in `require'
          from C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:88:in `block in server'
          from C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:85:in `tap'
          from C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:85:in `server'
          from C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
          from C:/RailsInstaller/Ruby2.3.0/lib/ruby/gems/2.3.0/gems/railties-5.0.2/lib/rails/commands.rb:18:in `&lt;top (required)&gt;'
          from bin/rails:4:in `require'
          from bin/rails:4:in `&lt;main&gt;'
  </code></pre>
  
  <p>pls help</p>