Native-diagnostic error

Ionic Native
1

constructor(public navCtrl: NavController, public navParams: NavParams,
public camera:Camera,public databaseProvider:DatabaseProvider,
public backgroundRun:BackgroundRun,public http:HttpClient,
public http2:Http,public diagnostic:Diagnostic,
private platform:Platform,
) {

this.platform.ready().then(() => {

  // this.diagnostic.isLocationAvailable().then( isAvailable => {
  //        console.log("Location available: " + isAvailable);
  // }).catch(error=>{

  //   console.log("Location");
  //   console.log(error);
  // });
  this.diagnostic.getBluetoothState()
  .then((state) => {
    console.log(state);
    if (state == this.diagnostic.bluetoothState.POWERED_ON){
      // do something
    } else {
      // do something else
    }

}).catch(e => console.error(e));
}).catch(error=>{

  console.log(error);
});

}

error:
ERROR TypeError: Object(…) is not a function
at Diagnostic.isLocationEnabled (vendor.js:127427)
at ListPage.webpackJsonp.11.ListPage.ionViewWillEnter (main.js:506)
at ViewController._lifecycle (vendor.js:35671)
at ViewController._willEnter (vendor.js:35569)
at NavControllerBase._willEnter (vendor.js:73491)
at vendor.js:73384
at t.invoke (polyfills.js:3)
at Object.onInvoke (vendor.js:5135)
at t.invoke (polyfills.js:3)
at r.run (polyfills.js:3)