# Angular fire 4 error injector

**URL:** <https://forum.ionicframework.com/t/angular-fire-4-error-injector/97501>\
**Category:** ionic-v3\
**Created:** [July 9, 2017, 3:41pm UTC](https://forum.ionicframework.com/t/angular-fire-4-error-injector/97501 "2017-07-09T15:41:08Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![MarinoRaul](https://sea1.discourse-cdn.com/ionicframework/user_avatar/forum.ionicframework.com/marinoraul/32/103586_2.png) [@MarinoRaul](https://forum.ionicframework.com/u/MarinoRaul)\
**Post date:** [July 9, 2017, 3:41pm UTC](https://forum.ionicframework.com/t/angular-fire-4-error-injector/97501/1 "2017-07-09T15:41:08Z")

</div>

Runtime Error  
undefined is not a function  
Stack  
TypeError: undefined is not a function  
at \_firebaseAppFactory ([http://localhost:8100/build/main.js:139685:16](http://localhost:8100/build/main.js:139685:16))  
at \_callFactory ([http://localhost:8100/build/main.js:11701:17](http://localhost:8100/build/main.js:11701:17))  
at \_createProviderInstance$1 ([http://localhost:8100/build/main.js:11640:26](http://localhost:8100/build/main.js:11640:26))  
at resolveNgModuleDep ([http://localhost:8100/build/main.js:11622:17](http://localhost:8100/build/main.js:11622:17))  
at \_callFactory ([http://localhost:8100/build/main.js:11697:34](http://localhost:8100/build/main.js:11697:34))  
at \_createProviderInstance$1 ([http://localhost:8100/build/main.js:11640:26](http://localhost:8100/build/main.js:11640:26))  
at resolveNgModuleDep ([http://localhost:8100/build/main.js:11622:17](http://localhost:8100/build/main.js:11622:17))  
at \_createClass ([http://localhost:8100/build/main.js:11677:32](http://localhost:8100/build/main.js:11677:32))  
at \_createProviderInstance$1 ([http://localhost:8100/build/main.js:11637:26](http://localhost:8100/build/main.js:11637:26))  
at resolveNgModuleDep ([http://localhost:8100/build/main.js:11622:17](http://localhost:8100/build/main.js:11622:17))  
Ionic Framework: ^3.5.0  
Ionic App Scripts: 1.3.12  
Angular Core: ^4.2.5  
Angular Compiler CLI: ^4.2.5  
Node: 7.6.0  
OS Platform: Linux 4.4  
Navigator Platform: Linux x86\_64  
User Agent: Mozilla/5.0 (X11; Linux x86\_64) AppleWebKit/537.36 (KHTML, like Gecko)

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[https://github.com/angular/angularfire2/blob/master/docs/Auth-with-Ionic3-Angular4.md](https://github.com/angular/angularfire2/blob/master/docs/Auth-with-Ionic3-Angular4.md)