Error: Attempting to access the 'HTML' property of an undefined value

Encountering an unusual error while working with Angular 2.0 RC4

Cannot read property 'HTML' of undefined

Error in index.html file

<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <title>My th</title>
  <base href="/">

  {{#unless environment.production}}
  <script src="/ember-cli-live-reload.js" type="text/javascript"></script>
  {{/unless}}
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" type="image/x-icon" href="favicon.ico">
  <link rel="stylesheet" href="styles.css">

  <link rel="stylesheet" href="vendor/bootstrap/dist/css/bootstrap.min.css">

</head>
<body>
   <div class="wrapper">
        <div id="ihc" class="navbar navbar-fixed-top brand">
            <div class="navbar-inner">
                <div class="container-fluid">
                    <div class="nav-collapse collapse"></div>
                </div>
             </div>
        </div>
        <div class="body-content">
             <my-app>Loading...</my-app>
        </div>
    </div>
    {{#each scripts.polyfills}}<script src="{{.}}"></script>{{/each}}
   <script src="vendor/ng2-bootstrap/bundles/ng2-bootstrap.min.js"></script>
    <script>
      System.import('system-config.js').then(function () {
        System.import('main');
      }).catch(console.error.bind(console));
    </script>
   <script src="vendor/ng2-bootstrap/bundles/ng2-bootstrap.min.js"></script>
</body>
</html>

Error in main.ts file

bootstrap(AppComponent, [
  disableDeprecatedForms(),
  provideForms(),
  provideRouter(AppRoutes)
  ,HTTP_PROVIDERS,
  provide(LocationStrategy, {useClass: HashLocationStrategy})

])
  .catch(err => console.error(err));

Here's the exception from DEV Console

zone.js:461 Unhandled Promise rejection: TypeError: Cannot read property 'HTML' of undefined
        at Object.eval (http://localhost:4200/vendor/@angular/compiler/src/schema/dom_security_schema.js:29:47)
        at eval (http://localhost:4200/vendor/@angular/compiler/src/schema/dom_security_schema.js:59:4)
        ...

Seeking assistance to troubleshoot this issue

Answer №1

Many times, this issue occurs when Angular2 is unable to locate a script that has been declared. Instead of receiving JavaScript, it ends up returning HTML (typically the index page).

To address this problem, you should access the developer tools on the page where the error is occurring and navigate to the network tab. Review each file's response and inspect whether any of the scripts are returning HTML instead of JavaScript. This could be due to incorrect paths or missing files.

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