title: Having error "ReferenceError: angular is not defined" in Angular js
body: <p>HTML file</p>
  
  <pre><code>   &lt;!DOCTYPE html&gt;
      &lt;html ng-app="tutorialApp"&gt;
      &lt;head&gt;
          &lt;meta charset="UTF-8"&gt;
          &lt;title&gt;Tutorial App&lt;/title&gt;
          &lt;script src="lib/angular.min.js"&gt;&lt;/script&gt;
          &lt;script src="lib/angular-route.min.js"&gt;&lt;/script&gt;
          &lt;script src="JS/app.js"&gt;&lt;/script&gt;
          &lt;script src="JS/controller/tutorialCtrl.js"&gt;&lt;/script&gt;
  
      &lt;/head&gt;
      &lt;body&gt;
      &lt;div ng-view&gt;&lt;/div&gt;
  
      &lt;/body&gt;
      &lt;/html&gt;
  </code></pre>
  
  <p>js file</p>
  
  <pre><code>var app = angular.module("tutorialApp", ["ngRoute", "tutorialCtrlModule"]);
  
  app.config(function ($routeProvider) {
      $routeProvider
          .when("/", {
              templateUrl: "views/tutorial.html",
              controller: "TutorialCtrl"
      })
          .when("/tutorialSecond", {
              templateUrl: "views/tutorialSecond.html",
              controller: "TutorialCtrl2"
          })
          .otherwise({
              redirectTo: "/"
          });
  });
  </code></pre>
  
  <p>When I run HTML file I see the first page. When I click to link that I created, it does not get me to the link.
  For the js file, there is an error "ReferenceError: angular is not defined"
  I do not know what to do.</p>