Flutter firebase auth UI have some issue, because of firebase\_auth version miss match issue 

My flutter app crashed and unable to identify an issue, after opening in an android studio, I got the issue and it is here 

```
Caused by: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.mycom.mypetshop. Make sure to call FirebaseApp.initializeApp(Context) first.
        at com.google.firebase.FirebaseApp.getInstance(com.google.firebase:firebase-common@@16.0.2:240)
        at com.google.firebase.auth.FirebaseAuth.getInstance(Unknown Source)
        at io.flutter.plugins.firebaseauth.FirebaseAuthPlugin.<init>(FirebaseAuthPlugin.java:54)
        at io.flutter.plugins.firebaseauth.FirebaseAuthPlugin.registerWith(FirebaseAuthPlugin.java:47)
        at io.flutter.plugins.GeneratedPluginRegistrant.registerWith(GeneratedPluginRegistrant.java:20)
        at com.vyapari2online.mypetshop.MainActivity.onCreate(MainActivity.java:11)
        at android.app.Activity.performCreate(Activity.java:5990)

```

How to solve this?

> 
> In project 'app' a resolved Google Play services library dependency
>  depends on another at an exact version (e.g. "[15.0. 1]", but isn't
>  being resolved to that version. Behavior exhibited by the library will
>  be unknown.
> 
> 
> Dependency failing: com.google.android.gms:play-services-flags:15.0.1
>  -> com.google.android.gms:play-services-basement@[
>  15.0.1], but play-services-basement version was 16.0.1.
> 
> 
> The following dependencies are project dependencies that are direct or
>  have transitive dependencies that lead to the art ifact with the
>  issue.
>  -- Project 'app' depends on project 'firebase\_auth' which depends onto com.google.firebase:firebase-auth@16.0.2
>  -- Project 'app' depends on project 'firebase\_core' which depends onto com.google.firebase:firebase-core@16.0.4
>  -- Project 'app' depends on project 'cloud\_firestore' which depends onto com.google.firebase:firebase-firestore@17.1.1
>  -- Project 'app' depends on project 'google\_sign\_in' which depends onto com.google.android.gms:play-services-auth@16.0.1
> 
> 
> For extended debugging info execute Gradle from the command line with
>  ./gradlew --info :app:assembleDebug to see the dep endency paths to
>  the artifact. This error message came from the google-services Gradle
>  plugin, report issues at https://
>  github.com/google/play-services-plugins and disable by adding
>  "googleServices { disableVersionCheck = false }" to your b uild.gradle
>  file.
> 
> 
> 

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