Rails 4: ExecJS::RuntimeError in Admin#index

I generated a Rails 4 app. I am not sure why I get the following error.

(in
C:/Ruby193/lib/ruby/gems/1.9.1/gems/turbolinks-1.3.1/lib/assets/javascripts/turbolinks.js.coffee)

Extracted source (around line #6):

3456789

Htspot <%= stylesheet_link_tag "application", media: "all", "data-turbolinks-track" => true %> <%= javascript_include_tag "application", "data-turbolinks-track" => true %> <%= csrf_meta_tags %>

Rails.root: C:/my_local/phone_hotspot
Application Trace http://localhost:3000/# | Framework
Tracehttp://localhost:3000/#| Full
Trace http://localhost:3000/#

app/views/layouts/application.html.erb:6:in
`_app_views_layouts_application_html_erb___495299681_42123264’

Request

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