angular2: how to resolve Error: (SystemJS) module is not defined?
<p>I am a new learner of angular2. We know in angular2 there is a way to reference a file by relative path which by defining <code>moduleId : module.id</code> in component meta data. However I tried to to by that way and always get the following error:</p>

<pre><code>Error: (SystemJS) module is not defined 
</code></pre>

<p>I have built a plunker here: <a href="https://plnkr.co/edit/Xd2v3t7u6HnbRiCKBFA6?p=preview" rel="nofollow noreferrer">a simple angular2 app</a></p>

<p>The file structure is as below, very simple:</p>

<p><a href="https://i.stack.imgur.com/vR0IX.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vR0IX.jpg" alt="enter image description here"></a></p>

<p>Content of each part is as below:</p>

<p><strong>config.js:</strong></p>

<pre><code>System.config({
    //use typescript for compilation
    transpiler: 'typescript',
    //typescript compiler options
    typescriptOptions: {
        emitDecoratorMetadata: true,
        module: "commonjs"
    },
    meta: {
        'typescript': {
            "exports": "ts"
        }
    },
    paths: {
        'npm:': 'https://unpkg.com/'
    },
    //map tells the System loader where to look for things
    map: {

        'app': './app',

        '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
        '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
        '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
        '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
        '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
        '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
        '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
        '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',

        '@angular/core/testing': 'npm:@angular/core/bundles/core-testing.umd.js',
        '@angular/common/testing': 'npm:@angular/common/bundles/common-testing.umd.js',
        '@angular/compiler/testing': 'npm:@angular/compiler/bundles/compiler-testing.umd.js',
        '@angular/platform-browser/testing': 'npm:@angular/platform-browser/bundles/platform-browser-testing.umd.js',
        '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
        '@angular/http/testing': 'npm:@angular/http/bundles/http-testing.umd.js',
        '@angular/router/testing': 'npm:@angular/router/bundles/router-testing.umd.js',

        'rxjs': 'npm:rxjs',
        'typescript': 'npm:typescript/lib/typescript.js'
    },
    //packages defines our app package
    packages: {
        app: {
            main: 'main.ts',
            defaultExtension: 'ts'
        },

        rxjs: {
            defaultExtension: 'js'
        }
    }
});
</code></pre>

<p><strong>app.component.ts:</strong></p>

<pre><code>import { Component } from '@angular/core';

@Component({
    moduleId: module.id,
    selector: 'app',
    templateUrl: 'app.component.html'
})
export class AppComponent {

}
</code></pre>

<p>For other file, you can refer to the plunker. I have set <code>module: "commonjs"</code> in typescriptOptions. Is there anything wrong with my codes?</p>