$ ionic cordova run android --device
Running app-scripts build: --platform android --target cordova
[13:43:33]  build dev started ...
[13:43:33]  clean started ...
[13:43:33]  clean finished in 3 ms
[13:43:33]  copy started ...
[13:43:33]  deeplinks started ...
[13:43:33]  deeplinks finished in 237 ms
[13:43:33]  transpile started ...
[13:43:38]  typescript: ...mpp/htdocs/project x/projectx/node_modules/angularfire2/firebase.app.module.d.ts, line: 2
            Module '"C:/xampp/htdocs/project x/projectx/node_modules/firebase/index"' has no exported member
            'functions'.

       L1:  import { InjectionToken } from '@angular/core';
       L2:  import { app, auth, database, firestore, functions, messaging, storage } from 'firebase/app';
       L3:  export declare type FirebaseOptions = {

      // ABOUT 200 LINES OF TYPESCRIPT WARNINGS..

[13:43:38]  typescript: C:/xampp/htdocs/project x/projectx/src/providers/service/score.ts, line: 2
            Module '"C:/xampp/htdocs/project x/projectx/node_modules/angularfire2/database/index"' has no exported
            member 'FirebaseObjectObservable'.

       L1:  import { Injectable } from '@angular/core';
       L2:  import { AngularFireDatabase, FirebaseObjectObservable } from 'angularfire2/database';

Error: Failed to transpile program
    at BuildError.Error (native)
    at new BuildError (C:\xampp\htdocs\project x\projectx\node_modules\@ionic\app-scripts\dist\util\errors.js:16:28)
    at C:\xampp\htdocs\project x\projectx\node_modules\@ionic\app-scripts\dist\transpile.js:159:20
    at transpileWorker (C:\xampp\htdocs\project x\projectx\node_modules\@ionic\app-scripts\dist\transpile.js:107:12)
    at Object.transpile (C:\xampp\htdocs\project x\projectx\node_modules\@ionic\app-scripts\dist\transpile.js:64:12)
    at C:\xampp\htdocs\project x\projectx\node_modules\@ionic\app-scripts\dist\build.js:109:82
[13:43:38]  copy finished in 5.41 s