Facebook login authentication in angular 2 getting error?

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Hi.,
I'm using ng2-facebook-sdk library's, and constructor declare this way constructor(private fb: FacebookService) getting error

What I have tried:

Declare index.html files

<base href="/" />
<script type="text/javascript" src="https://connect.facebook.net/en_US/sdk.js"></script>

I'm using this
import {FacebookService} from 'ng2-facebook-sdk';
constructor(private fb: FacebookService)
{
console.log('Initializing Facebook');
fb.init({
appId: '-------',
xfbml: true,
version: 'v2.8'
});


}