Flutter: Pengecualian Tanpa Hadangan GoogleSignIn

Saya menghadapi masalah aneh menggunakan plugin GoogleSignIn, saya belum menggunakan login Google selama beberapa bulan sekarang, dan saya memutuskan untuk menyambungkannya lagi hari ini ketika saya menghadapi masalah ini.

Saya menggunakan kode tes berikut

google_sign_in: "^1.0.1"
  firebase_auth: "^0.2.3"

import 'dart:async';

import "package:flutter/material.dart";
import "package:firebase_auth/firebase_auth.dart";
import "package:google_sign_in/google_sign_in.dart";


final FirebaseAuth _auth = FirebaseAuth.instance;
final GoogleSignIn _googleSignIn = new GoogleSignIn();

 _testSignInWithGoogle() async {
  final GoogleSignInAccount googleUser = await _googleSignIn.signIn();
  final GoogleSignInAuthentication googleAuth =
  await googleUser.authentication;
  final FirebaseUser user = await _auth.signInWithGoogle(
    accessToken: googleAuth.accessToken,
    idToken: googleAuth.idToken,
  );
  print (googleUser.displayName);
  return (user);
}
class TestSignIn extends StatefulWidget {
  <strong i="9">@override</strong>
  _TestSignInState createState() => new _TestSignInState();
}

class _TestSignInState extends State<TestSignIn> {
   <strong i="10">@override</strong>
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(title: new Text("test"),
      ),
      body: new Column(
        children: <Widget>[
          new FlatButton(onPressed: ()=>_testSignInWithGoogle(), child: new Text("Test SignIn Google"),),
          //print user
        ],
      )
    );
  }
}



md5-479999e22daf708410ceaf35566d1955




E/flutter (13210): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter (13210): PlatformException(status, Status{statusCode=DEVELOPER_ERROR, resolution=null}, null)
E/flutter (13210): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:514)
E/flutter (13210): #1      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:154)
E/flutter (13210): <asynchronous suspension>
E/flutter (13210): #2      GoogleSignIn._callMethod (package:google_sign_in/google_sign_in.dart:156)
E/flutter (13210): <asynchronous suspension>
E/flutter (13210): #3      GoogleSignIn._addMethodCall (package:google_sign_in/google_sign_in.dart:180)
E/flutter (13210): #4      GoogleSignIn.signIn (package:google_sign_in/google_sign_in.dart:237)
E/flutter (13210): #5      _testSignInWithGoogle (package:full3/TestSignIn.dart:12)
E/flutter (13210): <asynchronous suspension>
E/flutter (13210): #6      _TestSignInState.build.<anonymous closure> (package:full3/TestSignIn.dart:47)
E/flutter (13210): #7      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:323)
E/flutter (13210): #8      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:375)
E/flutter (13210): #9      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102)
E/flutter (13210): #10     TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:161)
E/flutter (13210): #11     TapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:94)
E/flutter (13210): #12     PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:315)
E/flutter (13210): #13     PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:73)
E/flutter (13210): #14     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101)
E/flutter (13210): #15     BindingBase&SchedulerBinding&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:143)
E/flutter (13210): #16     BindingBase&SchedulerBinding&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121)
E/flutter (13210): #17     BindingBase&SchedulerBinding&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101)
E/flutter (13210): #18     BindingBase&SchedulerBinding&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64)
E/flutter (13210): #19     BindingBase&SchedulerBinding&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48)
E/flutter (13210): #20     _invoke1 (file:///b/build/slave/Linux_Engine/build/src/flutter/lib/ui/hooks.dart:105)
E/flutter (13210): #21     _dispatchPointerDataPacket (file:///b/build/slave/Linux_Engine/build/src/flutter/lib/ui/hooks.dart:63)
D/EGL_emulation(13210): eglMakeCurrent: 0xa9205720: ver 3 0 (tinfo 0x946fc060)

Saya tidak berpikir masalah ini jika dari sisi Firebase. Firebase dikonfigurasi dengan benar dengan aplikasi saya dan berfungsi dengan baik dengan nama pengguna/kata sandi.