Flutter error trying to connect with google account - firebase

Question

When i try to sign in with my google account in the app i get this error in the console
And the app shut down , i used the sign in method in firebase- google
And this is the code that i used for the sign up page
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'auth.dart';
import 'package:google_sign_in/google_sign_in.dart';
class LoginScreen extends StatefulWidget {
#override
_LoginPageState createState() => _LoginPageState();
}
class _LoginPageState extends State<LoginScreen> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
LoginButton(), // <-- Built with StreamBuilder
UserProfile()
],
)));
}
}
class UserProfile extends StatefulWidget {
#override
UserProfileState createState() => UserProfileState();
}
class UserProfileState extends State<UserProfile> {
Map<String, dynamic> _profile;
bool _loading = false;
#override
initState() {
super.initState();
// Subscriptions are created here
authService.profile.listen((state) => setState(() => _profile = state));
authService.loading.listen((state) => setState(() => _loading = state));
}
#override
Widget build(BuildContext context) {
return Column(children: <Widget>[
Container(padding: EdgeInsets.all(20), child: Text(_profile.toString())),
Text(_loading.toString())
]);
}
}
class LoginButton extends StatelessWidget {
#override
Widget build(BuildContext context) {
return StreamBuilder(
stream: authService.user,
builder: (context, snapshot) {
if (snapshot.hasData) {
return MaterialButton(
onPressed: () => authService.signOut(),
color: Colors.red,
textColor: Colors.white,
child: Text('Signout'),
);
} else {
return MaterialButton(
onPressed: () => authService.testSignInWithGoogle(),
color: Colors.white,
textColor: Colors.black,
child: Text('Login with Google'),
);
}
});
}
}
and this for authentification
import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:rxdart/rxdart.dart';
class AuthService {
// Dependencies
final GoogleSignIn _googleSignIn = GoogleSignIn();
final FirebaseAuth _auth = FirebaseAuth.instance;
final Firestore _db = Firestore.instance;
// Shared State for Widgets
Observable<FirebaseUser> user; // firebase user
Observable<Map<String, dynamic>> profile; // custom user data in Firestore
PublishSubject loading = PublishSubject();
// constructor
AuthService() {
user = Observable(_auth.onAuthStateChanged);
profile = user.switchMap((FirebaseUser u) {
if (u != null) {
return _db
.collection('users')
.document(u.uid)
.snapshots()
.map((snap) => snap.data);
} else {
return Observable.just({});
}
});
}
Future<String> testSignInWithGoogle() async {
final GoogleSignInAccount googleUser = await _googleSignIn.signIn();
final GoogleSignInAuthentication googleAuth =
await googleUser.authentication;
final AuthCredential credential = GoogleAuthProvider.getCredential(
accessToken: googleAuth.accessToken,
idToken: googleAuth.idToken,
);
final FirebaseUser user =
(await _auth.signInWithCredential(credential)).user;
assert(user.email != null);
assert(user.displayName != null);
assert(!user.isAnonymous);
assert(await user.getIdToken() != null);
final FirebaseUser currentUser = await _auth.currentUser();
assert(user.uid == currentUser.uid);
return 'signInWithGoogle succeeded: $user';
}
Future<String> signOut() async {
try {
await _auth.signOut();
return 'SignOut';
} catch (e) {
return e.toString();
}
}
}
// TODO refactor global to InheritedWidget
final AuthService authService = AuthService();
and this is what i have in pubspec.yml:
dependencies:
flutter:
sdk: flutter
firebase_core: ^0.4.5
firebase_analytics: ^5.0.15
cloud_firestore: ^0.13.6
firebase_auth: ^0.16.1
google_sign_in: ^4.5.1
rxdart: ^0.22.6
cupertino_icons: ^0.1.3