Trying to play audio with Ionic Native Media plugin

home.ts

import { Component } from '@angular/core';
import { Platform } from 'ionic-angular';
import { File } from '@ionic-native/file';
import { Media, MediaObject } from '@ionic-native/media';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {


  constructor(public file: File, public media: Media, public platform: Platform) {
  }

  startRecord() {
    let src = this.file.externalDataDirectory + "audio.wav";
    let audioObject = this.media.create(src);
    audioObject.onStatusUpdate.subscribe(status => console.log(status));
    audioObject.onError.subscribe(error => console.log('rec error', error));
    audioObject.onSuccess.subscribe(() => console.log('rec done'));
    audioObject.startRecord();
    setTimeout(() => {
      audioObject.stopRecord();
      audioObject.release();
      console.log('done recording');
    }, 3000);
  }


  startPlayback() {
    let src = this.file.externalDataDirectory + "audio.wav";
    let audioObject = this.media.create(src);
    audioObject.onStatusUpdate.subscribe(status => console.log(status));
    audioObject.onError.subscribe(error => console.log('play error', error));
    audioObject.onSuccess.subscribe(() => console.log('play done'));
    console.log(audioObject);
    audioObject.play();
  }

  async listDir() {
    try {
      let files = await this.file.listDir(this.file.externalDataDirectory, "")
      console.log(files)
    } catch(err) {
      console.log("Error listing files", err)
    }
  }

}