Rails错误：帖子中的ExecJS :: ProgramError #index

Question

刚刚安装了新的导轨安装。按照this tutorial中的步骤操作。在14:04，索引页面应该出现。

运行索引页时出现此错误：

ExecJS::ProgramError in Posts#index
Showing C:/Sites/Simpleblog/app/views/layouts/application.html.erb where line #7 raised:
TypeError: Object doesn't support this property or method
Extracted source (around line #7):

    <%= csrf_meta_tags %>
    <%= stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track': 'reload' %>
    <%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
  </head>


Rails.root: C:/Sites/Simpleblog

第7行是：

<%= stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track': 'reload' %>

这是routes.rb：

Rails.application.routes.draw do
  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html

root 'posts#index'  



end

这是posts_controller：

class PostsController < ApplicationController
    def index

    end
end