Ionic backgorund mode crash

I am trying to make run a background mode with Ionic, but when I am playing a song, and I enabled the Backgound Mode, the app crashes.

Actually, is posible make the background mode with Ionic?

This is my code:

import { Component } from '@angular/core';import {NavController} from '@ionic/angular';import {NativeAudio} from '@ionic-native/native-audio/ngx';import {BackgroundMode} from '@ionic-native/background-mode/ngx';@Component({  selector: 'app-home',  templateUrl: 'home.page.html',  styleUrls: ['home.page.scss'],})export class HomePage {  constructor(public navCtrl: NavController,              public nativeAudio: NativeAudio ,              public backgroundMode: BackgroundMode) {    this.nativeAudio.preloadSimple('audio1', 'assets/audio1.mp3').then((msg) => {      console.log('message: '+ msg);    }, (error) => {      console.log('error: '+ error);    });  }  public playAudio(){    this.backgroundMode.enable();    this.backgroundMode.on('activate').subscribe(() => {      this.nativeAudio.play('audio1');    });    this.nativeAudio.play('audio1', () => console.log('audio1 is done playing'));  }}

This is my current config.

/bg-mode-example$ ionic infoIonic:   Ionic CLI                     : 6.11.11 (/usr/local/lib/node_modules/@ionic/cli)   Ionic Framework               : @ionic/angular 5.3.5   @angular-devkit/build-angular : 0.1000.8   @angular-devkit/schematics    : 10.0.8   @angular/cli                  : 10.0.8   @ionic/angular-toolkit        : 2.3.3Cordova:   Cordova CLI       : 10.0.0   Cordova Platforms : android 9.0.0   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 4.2.1, (and 6 other plugins)Utility:   cordova-res (update available: 0.15.1) : 0.6.0   native-run (update available: 1.2.1)   : 0.2.8System:   Android SDK Tools : 26.1.1 (/home/gabriel/Android/Sdk)   NodeJS            : v10.19.0 (/usr/bin/node)   npm               : 6.14.8   OS                : Linux 5.4

Addionationally, I have a gitlab repo https://gitlab.com/gabrielrincon/bgmode-testing/

What is wrong?

Thanks very much.