ror error

pages_controllers_spec.rb
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 require 'spec_helper'

describe PagesController do
  render_views

  describe "GET 'home'" do
    it "should be successful" do
      get 'home'
      response.should be_success
    end

    it "should have the right title" do
      get 'home'
      response.should have_selector("title",
                 :content => "Ruby on Rails Tutorial Sample App | Home")
  end
end

  describe "GET 'contact'" do
    it "should be successful" do
      get 'contact'
      response.should be_success
  end

   it "should have the right title" do
      get 'contact'
      response.should be_selector("title",
                :content => "Ruby on Rails Tutorial Sample App | Contact")
    end
  end

    describe "GET 'about'" do
    it "should be successful" do
      get 'about'
      response.should be_success
  end

   it "should have the right title" do
      get 'about'
      response.should have_selector("title",
                :content => "Ruby on Rails Tutorial Sample App | About")
    end
  end
end
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application.html.erb

<!DOCTYPE html>
<html>
<head>
<title>Ruby on Rails Tutorial Sample App | <%= @title %></title>
  <%= stylesheet_link_tag    "application", :media => "all" %>
  <%= javascript_include_tag "application" %>
  <%= csrf_meta_tags %>
</head>
<body>

<%= yield %>

</body>
</html>
_____________________
pages.controller.rb

class PagesController < ApplicationController
  def home
  	@title = "Home"
  end
  def contact
	@title = "Contact"
  end
  def about
  	    @title = "About"
  end
end
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about.html.erb

<!doctype html>
<html lang="en">
<head>
	<title>Ruby on Rails Tutorial Sample App | About</title>
</head>
<body>
	<h1>About Us</h1>
	<p>This is the about page for the <a href="http://railstutorial.org/">Ruby on Rails Tutorial</a> sample application.</p>
</body>
</html>
____________
home.html.erb

<!doctype html>
<html lang="en">
<head>
	<title>Ruby on Rails Tutorial Sample App | Home</title>
</head>
<body>
	<h1>Home</h1>
<p>This is the home page for the <a href="http://railstutorial.org/">Ruby on Rails Tutorial</a> sample application.</p>
</body>
</html>
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contact.html.erb

<!doctype html>
<html lang="en">
<head>
	<title>Ruby on Rails Tutorial Sample App | Contact</title>
</head>
<body>
	<h1>Contact</h1>
<p>This is the contact page for the <a href="http://railstutorial.org/">Ruby on Rails Tutorial</a> sample application.
</p>
</body>
</html>

____________________