[Flutter] Can't configure google_sign_in without firebase

I install google_sign_in and create successfully my keytool sha key , i configure my google console acccount and create credentials (i enable also People API).

I pass my generate keytool file into android/app folder and put that code in build.grandle :

signingConfigs{
debug{
keyAlias 'xxxxx'
storePassword 'xxxxx'
storeFile file('xxxxx.jks')
keyPassword 'xxxxx'
}
}

buildTypes {
release {
signingConfig signingConfigs.debug
}
debug{
signingConfig signingConfigs.debug
}
}


Also i put that on manifest :

<activity android:name="com.google.android.gms.auth.api.signin.internal.SignInHubActivity" />


When i run it it still gives me errors like this :

I/flutter (32747): PlatformException(sign_in_failed, com.google.android.gms.common.api.ApiException: 10: , null, null)


What else i forgot ?

Here is my fluter code :

final GoogleSignIn _googleSignIn = GoogleSignIn(
scopes: ['email'],
clientId:"XXXXXXXXXXXX"
);

Future<void> google_LogIn(BuildContext context) async {
try {
print(1);
final GoogleSignInAccount? googleUser = await _googleSignIn.signIn();
print(2);
if (googleUser != null) {
final GoogleSignInAuthentication googleAuth =
await googleUser.authentication;
print(3);
print('Token : ${googleAuth.idToken!}');
final response = await http.post(
Uri.parse('${dotenv.env['baseUrl']}/auth_google'),
headers: <String, String>{
'Content-Type': 'application/json; charset=UTF-8',
},
body: jsonEncode(<String, String>{
'idToken': googleAuth.idToken!,
}),
);

if (response.statusCode == 200) {
final Map<String, dynamic> user = jsonDecode(response.body);
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Text('Sign in successful! Welcome ${user['name']}')),
);
} else {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(content: Text('Failed to sign in with Google')),
);
}
}
} catch (error) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(content: Text('Error occurred during Google sign in: $error')),
);
print(error);
}
}


And my node server :


const { OAuth2Client } = require('google-auth-library');

//Google Auth
async auth_google(req, res) {
try {
const token = req.body.idToken;
const payload = await logIn_Controller.verify(token);
res.status(200).json(payload);
} catch (error) {
res.status(401).json({ error: 'Invalid token' });
}
},


async verify(token) {
const ticket = await client.verifyIdToken({
idToken: token,
audience: CLIENT_ID,
});
const payload = ticket.getPayload();
return payload;
},


When i try to print the token is null also .

Some times if i comment the scopes and clientId it says this :

I/flutter (18971): Null check operator used on a null value


So what is my problem ?

The node server is not even triggered so something wrong about auth ,specific in this command :

final GoogleSignInAuthentication googleAuth =
await googleUser.authentication;


Because the first one is returning some info data about the users .So im guessing that is something wrong in that specific command.

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