Unknown provider: FIREBASE_URLProvider <- FIREBASE_URL <- Post

The full error Error: [$injector:unpr] Unknown provider: FIREBASE_URLProvider <- FIREBASE_URL <- Post

The local server spun up a working app just a couple of days ago. Now when I start it, app is blank and throws up this error. Anyone knows the issue?

Im following a online lesson and perhaps the versions are outdated?

The error link leads to this page. ERROR LINK PAGE IN ANGULARJS but my definitions are ok since they were working previously?


Attached is my index.html scripts. 

<!-- build:js scripts/vendor.js -->
    <!-- <script src="vendor/someContribJs.js"></script> -->
    <!-- bower:js -->
    <script src="bower_components/angular/angular.js"></script>
    <script src="bower_components/angular-animate/angular-animate.js"></script>
    <script src="bower_components/angular-sanitize/angular-sanitize.js"></script>
    <script src="bower_components/angular-ui-router/release/angular-ui-router.js"></script>
    <script src="bower_components/ionic/release/js/ionic.js"></script>
    <script src="bower_components/ionic/release/js/ionic-angular.js"></script>
    <script src="bower_components/lodash/dist/lodash.compat.js"></script>
    <script src="bower_components/firebase/firebase.js"></script>
    <script src="bower_components/firebase-simple-login/firebase-simple-login.js"></script>
    <script src="bower_components/angularfire/angularfire.js"></script>
    <!-- endbower -->
    <!-- endbuild -->

    <!-- build:js({.tmp,app}) scripts/scripts.js -->
    <!--all the scripts for the app --> 
    <!-- endbuild -->

    <!-- cordova script (this will be a 404 during development) -->
    <script src="cordova.js"></script>

This is just a wild guess, but try placing the angularfire.js script before the firebase-simple-login.js

<script src="bower_components/angular/angular.js"></script>
<script src="bower_components/angular-animate/angular-animate.js"></script>
<script src="bower_components/angular-sanitize/angular-sanitize.js"></script>
<script src="bower_components/angular-ui-router/release/angular-ui-router.js"></script>
<script src="bower_components/ionic/release/js/ionic.js"></script>
<script src="bower_components/ionic/release/js/ionic-angular.js"></script>
<script src="bower_components/lodash/dist/lodash.compat.js"></script>
<script src="bower_components/firebase/firebase.js"></script>
<script src="bower_components/angularfire/angularfire.js"></script>
<script src="bower_components/firebase-simple-login/firebase-simple-login.js"></script>

Another guess would be to check if there is a missing configuration concerning the firebase url.

I solved it.

I had another Var X = angular.module(myapp, []) line hidden somewhere in the app.js codes. Not sure how it got there but removing that did the trick. So the error message was correct.