White screen on Android

I do have the same problem since I began to learn Ionic: starting with a very simple app, with not even a modification inside after app creation, I’m not able to see the application under any android emulator, I always get a white screen.

system information:

Cordova CLI: 6.4.0
Ionic CLI Version: 2.2.3
Ionic App Lib Version: 2.2.1
ios-deploy version: Not installed
ios-sim version: Not installed
OS: Windows 7
Node Version: v7.9.0
Xcode version: Not installed

“name”: “ionic-hello-world”,
“version”: “0.0.0”,
“author”: “Ionic Framework”,
“homepage”: “http://ionicframework.com/”,
“private”: true,
“scripts”: {
“clean”: “ionic-app-scripts clean”,
“build”: “ionic-app-scripts build”,
“ionic:build”: “ionic-app-scripts build”,
“ionic:serve”: “ionic-app-scripts serve”
“dependencies”: {
"@angular/common": “4.0.2”,
"@angular/compiler": “4.0.2”,
"@angular/compiler-cli": “4.0.2”,
"@angular/core": “4.0.2”,
"@angular/forms": “4.0.2”,
"@angular/http": “4.0.2”,
"@angular/platform-browser": “4.0.2”,
"@angular/platform-browser-dynamic": “4.0.2”,
"@ionic-native/core": “3.4.2”,
"@ionic-native/splash-screen": “3.4.2”,
"@ionic-native/status-bar": “3.4.2”,
"@ionic/storage": “2.0.1”,
“ionic-angular”: “3.1.1”,
“ionicons”: “3.0.0”,
“rxjs”: “5.1.1”,
“sw-toolbox”: “3.4.0”,
“zone.js”: “^0.8.5”
“devDependencies”: {
"@ionic/app-scripts": “^1.3.6”,
“typescript”: “~2.2.1”
“cordovaPlugins”: [
“cordovaPlatforms”: [],
“description”: “P3New: An Ionic project”

Debug with chrome inspect is fine except an error with core.es5.js.map/android_asset/www/build GET failed net::ERR_FILE (Request URL:file:///android_asset/www/build/core.es5.js.map)

I can use whatever template, I always get the same white screen problem.