ng2-simple-page-scroll 404s via SystemJs

[SouengKimmeng]

I try to follow that already finally it still not work. here is my code
npm install ng2-simple-page-scroll --save

In app.module

import {Ng2SimplePageScrollModule} from 'ng2-simple-page-scroll';

@NgModule({
    imports: [
        /* Other imports here */
        Ng2SimplePageScrollModule.forRoot()
        ]
})
export class AppModule {}

In Systemjs.config

System.config({
    paths: {
        'npm:': 'node_modules/'
    },
    map: {
        app: 'app',

        '@angular/core'   : 'npm:@angular/core/bundles/core.umd.js',
        '@angular/common' : 'npm:@angular/common/bundles/common.umd.js',
        // further angular bundles...

        'ng2-simple-page-scroll/ng2-simple-page-scroll': 'npm:ng2-simple-page-scroll/bundles/ng2-simple-page-scroll.umd.js',

        rxjs: 'npm:rxjs',
    },
    packages: {
        app : {defaultExtension: 'js', main: './main.js'},
        rxjs: {defaultExtension: 'js'}
    }
});