AppRootToken is not defined in android prod build

Hi Team,
Please help me to fix the below error when I try to build android app with --prod :

Uncaught ReferenceError: AppRootToken is not defined
    at Function.t.forRoot (main.js:63)
    at main.js:59
    at Object.<anonymous> (main.js:59)
    at e (main.js:1)
    at Object.<anonymous> (main.js:50)
    at e (main.js:1)
    at Object.<anonymous> (main.js:74)
    at e (main.js:1)
    at main.js:1
    at main.js:1

Here is my ionic info,

cli packages: 

    @ionic/cli-utils  : 1.12.0
    ionic (Ionic CLI) : 3.12.0

global packages:

    cordova (Cordova CLI) : 8.1.2 (cordova-lib@8.1.1) 

local packages:

    @ionic/app-scripts : 1.3.7
    Cordova Platforms  : android 6.2.0
    Ionic Framework    : ionic-angular 3.3.0

System:

    Android SDK Tools : 26.1.1
    Node              : v6.17.0
    npm               : 3.10.10 
    OS                : macOS High Sierra

Misc:

    backend : pro

Here is my package.json:

{
  "name": "Ionic",
  "version": "0.0.1",
  "author": "Ionic Framework",
  "homepage": "http://ionicframework.com/",
  "private": true,
  "scripts": {
    "clean": "ionic-app-scripts clean",
    "build": "ionic-app-scripts build",
    "lint": "ionic-app-scripts lint",
    "ionic:build": "ionic-app-scripts build",
    "ionic:serve": "ionic-app-scripts serve"
  },
  "dependencies": {
    "@angular/common": "4.1.2",
    "@angular/compiler": "4.1.2",
    "@angular/compiler-cli": "4.1.2",
    "@angular/core": "4.1.2",
    "@angular/forms": "4.1.2",
    "@angular/http": "4.1.2",
    "@angular/platform-browser": "4.1.2",
    "@angular/platform-browser-dynamic": "4.1.2",
    "@ionic-native/app-version": "^3.10.2",
    "@ionic-native/call-number": "^3.10.2",
    "@ionic-native/camera": "^3.10.2",
    "@ionic-native/contacts": "^3.10.2",
    "@ionic-native/core": "3.10.2",
    "@ionic-native/device": "^3.10.2",
    "@ionic-native/diagnostic": "^3.10.2",
    "@ionic-native/facebook": "^3.10.2",
    "@ionic-native/geolocation": "^3.10.2",
    "@ionic-native/google-analytics": "^3.10.2",
    "@ionic-native/google-maps": "^3.10.2",
    "@ionic-native/google-plus": "^3.10.2",
    "@ionic-native/image-picker": "^3.10.2",
    "@ionic-native/keyboard": "^3.10.2",
    "@ionic-native/network": "^3.10.2",
    "@ionic-native/push": "^3.10.2",
    "@ionic-native/sms": "^3.10.2",
    "@ionic-native/social-sharing": "^3.10.2",
    "@ionic-native/spinner-dialog": "^3.10.2",
    "@ionic-native/splash-screen": "3.10.2",
    "@ionic-native/status-bar": "3.10.2",
    "@ionic-native/toast": "^3.10.2",
    "@ionic/cloud-angular": "^0.12.0",
    "@ionic/storage": "2.0.1",
    "angular2-moment": "^1.3.3",
    "cordova-android": "^6.2.0",
    "cordova-plugin-device": "^1.1.4",
    "cordova-plugin-google-analytics": "^1.8.4",
    "cordova-plugin-ionic-webview": "^1.2.1",
    "cordova-plugin-splashscreen": "^4.0.3",
    "cordova-plugin-whitelist": "^1.3.1",
    "cordova-plugin-x-toast": "~2.7.2",
    "hammerjs": "2.0.8",
    "ionic-angular": "3.3.0",
    "ionic-plugin-keyboard": "~2.2.1",
    "ionicons": "3.0.0",
    "q": "1.4.1",
    "rxjs": "^5.1.1",
    "socket.io-client": "^1.6.0",
    "sw-toolbox": "3.6.0",
    "zone.js": "0.8.18"
  },
  "devDependencies": {
    "@ionic/app-scripts": "^1.3.7",
    "@types/googlemaps": "3.26.0",
    "typescript": "^2.9.2"
  },
  "description": "An Ionic project",
  "config": {
    "ionic_webpack": "./webpack.config.js"
  },
  "cordova": {
    "plugins": {
      "ionic-plugin-keyboard": {},
      "cordova-plugin-whitelist": {},
      "cordova-plugin-device": {},
      "cordova-plugin-splashscreen": {},
      "cordova-plugin-ionic-webview": {},
      "cordova-plugin-x-toast": {},
      "cordova-plugin-googlemaps": {
        "API_KEY_FOR_ANDROID": "",
        "API_KEY_FOR_IOS": ""
      },
      "cordova-plugin-console": {},
      "cordova-plugin-statusbar": {},
      "cordova-plugin-spinner-dialog": {},
      "cordova-plugin-x-socialsharing": {},
      "cordova-plugin-googleplus": {
        "REVERSED_CLIENT_ID": ""
      },
      "cordova-plugin-camera": {},
      "cordova-plugin-contacts": {},
      "cordova-plugin-geolocation": {},
      "cordova-plugin-network-information": {},
      "es6-promise-plugin": {},
      "cordova-plugin-telerik-imagepicker": {},
      "cordova-plugin-facebook4": {
        "APP_ID": "",
        "APP_NAME": ""
      },
      "ionic-plugin-deploy": {},
      "cordova-plugin-google-analytics": {
        "GMS_VERSION": "11.0.1"
      },
      "phonegap-plugin-push": {
        "SENDER_ID": ""
      }
    },
    "platforms": [
      "android"
    ]
  }
}

P.S: I also have referred the following links but none helped me

Downgrading typescript to “2.6.2” saved my life :grinning: