Google Maps BaseClass ERROR

#1

Good morning, I have a problem with Google Maps, all work correctly with ‘ionic cordova run browser’, but with ‘ionic serve’ not work in mobile phone, I want execute in mobile Android, real device. And I have the next error:

core.js:15714 ERROR Error: Uncaught (in promise): TypeError: Cannot read property 'BaseClass' of null
TypeError: Cannot read property 'BaseClass' of null
    at GoogleMap.BaseClass (index.js:246)
    at new GoogleMap (index.js:1094)
    at GoogleMapsOriginal.create (index.js:203)
    at EventDetailsPage.webpackJsonp.166.EventDetailsPage.loadMap (event-details.ts:47)
    at event-details.ts:31
    at t.invoke (polyfills.js:3)
    at Object.onInvoke (core.js:17289)
    at t.invoke (polyfills.js:3)
    at r.run (polyfills.js:3)
    at polyfills.js:3
    at c (polyfills.js:3)
    at polyfills.js:3
    at t.invokeTask (polyfills.js:3)
    at Object.onInvokeTask (core.js:17280)
    at t.invokeTask (polyfills.js:3)
    at r.runTask (polyfills.js:3)
    at o (polyfills.js:3)
    at e.invokeTask [as invoke] (polyfills.js:3)
    at p (polyfills.js:2)
    at HTMLImageElement.v (polyfills.js:2)

How I execute in mobile phone?

I have google-maps 5.0.0 beta 22

And the file .ts here:

import { Component, ViewChild, OnInit } from '@angular/core';
import { IonicPage, NavController, NavParams, Platform } from 'ionic-angular';
import { GoogleMaps, GoogleMap, GoogleMapOptions, Environment } from '@ionic-native/google-maps';

@IonicPage()
@Component({
  selector: 'page-event-details',
  templateUrl: 'event-details.html',
})
export class EventDetailsPage{

  @ViewChild('map') element;
  map: GoogleMap
  event: any;
  slideOpts = {
    effect: 'flip'
  };

  constructor(public navCtrl: NavController, 
    public navParams: NavParams, 
    public platform: Platform) {
    this.event = navParams.data;
  }

  goBack() {
    this.navCtrl.pop();
  }  

  ngAfterViewInit() {
    this.platform.ready().then(() => {
      this.loadMap();
    });
  }

  loadMap() {
    let mapOptions: GoogleMapOptions = {
      camera: {
        target: {
          lat: this.event.latitude, // default location
          lng: this.event.longitude // default location
        },
        zoom: 18,
        tilt: 30
      }
    };
  
    this.map = GoogleMaps.create('map_canvas', mapOptions);
  }


}

Thank you!