for the first time using angular2 , following the instruction from 5 minute Quickstart guide for angular 2.
everything is working good, means no error while run npm start 
npm start image
but when i open
localhost:3000
it show Loading... text which is not expecting. according to this example content of index.html should reflects on this.
in console there is error :
EXCEPTION: TypeError: Cannot set property 'endSourceSpan' of null
import { bootstrap } from '@angular/platform-browser-dynamic';
import { AppComponent } from './app.component';
bootstrap(AppComponent);
import { Component } from '@angular/core';
@Component({
    selector: 'my-app',
    template: 'My first Angular 2 App</h1>'
})
export class AppComponent {}
<html>
  <head>
    <title>Angular 2 QuickStart</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="styles.css">
    <!-- 1. Load libraries -->
     <!-- Polyfill(s) for older browsers -->
    <script src="node_modules/es6-shim/es6-shim.min.js"></script>
    <script src="node_modules/zone.js/dist/zone.js"></script>
    <script src="node_modules/reflect-metadata/Reflect.js"></script>
    <script src="node_modules/systemjs/dist/system.src.js"></script>
    <!-- 2. Configure SystemJS -->
    <script src="systemjs.config.js"></script>
    <script>
      System.import('app').catch(function(err){ console.error(err); });
    </script>
  </head>
  <!-- 3. Display the application -->
  <body>
    <my-app>Loading...</my-app>
  </body>
</html>
Kindly help me what is going wrong.
I think that you have a problem in the template of your main component. For example a HTML element that isn't correctly closed:
template : '<div</div>'
See this issue for more details:
Edit
The problem is that your h1 isn't correct (no begin element):
@Component({
  selector: 'my-app',
  template: '<h1>My first Angular 2 App</h1>' // <------
})
export class AppComponent {}
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