MissingPluginException(No implementation found for method signInAnonymously on channel plugins.flutter.io/firebase_auth)

Question

I'm trying to log in anonymously on my firebase, I have added all the needed stuff that shows in the FireBase page, but for some reason when I try to log in anonymously, I get this erro:

I/flutter ( 1656): MissingPluginException(No implementation found for method signInAnonymously on 
channel plugins.flutter.io/firebase_auth)
I/flutter ( 1656): Log in error

This is my sign in anonymously code, doesn't show me any errors on my page:

import 'package:firebase_auth/firebase_auth.dart';

//Definir os metodos que vao interagir com firebase
class AuthService {

final FirebaseAuth _auth = FirebaseAuth.instance;

//Logar anonimamente
Future signInAnon() async {
try {
  AuthResult result = await _auth.signInAnonymously();
  FirebaseUser user = result.user;
  return user;
}catch (e) {
  print(e.toString());
  return null;
}
}

Calling it in main page:

import 'package:flutter/material.dart';
import 'package:homeautomation/services/auth.dart';

class _SignInState extends State<SignIn> {
 final AuthService _auth = AuthService();
 ...
 Body:
 Child: RaisedButton(
      child: Text('Logar Anonimamente'),
      onPressed: () async {

        dynamic result = await _auth.signInAnon();
        if (result == null)
          {
            print('erro ao logar');
          }
        else
          {
            print('Logado');
            print(result);
          }
      },
    ),

Restarted Android Studio, and I'm getting a different error now:

PlatformException(ERROR_API_NOT_AVAILABLE, API: 
InternalFirebaseAuth.FIREBASE_AUTH_API is not available on this device. 
Connection failed with: ConnectionResult{statusCode=SERVICE_INVALID, 
resolution=null, message=null}, null)
I/flutter ( 2963): erro ao logar

Answer 1

Have you enabled sign in anonymously in your Firebase console? If NO, you have to enable it in the Firebase Console.

If YES, run flutter clean and your code should be free from errors.

If flutter clean doesn't work,

Check if the device you are running on has Google Play Services, if it does not. You have to install. it to stop seeing that error.

I hope this helps.