MissingPluginException(No implementation found for method login on channel app.meedu/flutter_facebook_auth) - flutter-facebook-login

Question

i got this error but not solve.i follow the step properly
this is code of my login page
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:flutter_facebook_auth/flutter_facebook_auth.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:provider/provider.dart';
class loginpage extends StatefulWidget {
const loginpage({Key? key}) : super(key: key);
#override
State<loginpage> createState() => _loginpageState();
}
enum LoginType { facebook, google, apple }
class _loginpageState extends State<loginpage> {
FirebaseAuth _auth = FirebaseAuth.instance;
bool _fetching = true;
User? get _currentUser => _auth.currentUser;
#override
void initState() {
super.initState();
_checkLogin();
}
Future<void> _checkLogin() async {
await Future.delayed(Duration(seconds: 1));
_fetching = false;
setState(() {});
}
void _login(LoginType type) async {
setState(() {
_fetching = true;
});
OAuthCredential? credential;
if (type == LoginType.facebook) {
credential = (await _loginWithFacebook()) as OAuthCredential;
} else if (type == LoginType.google) {
credential = (await _loginWithGoogle()) as OAuthCredential;
}
if (credential != null) {
await _auth.signInWithCredential(credential);
}
setState(() {
_fetching = false;
});
}
Future<OAuthCredential?> _loginWithFacebook() async {
final AccessToken accessToken = (await FacebookAuth.instance.login()) as AccessToken;
print(accessToken);
return FacebookAuthProvider.credential(
accessToken.token,
);
}
Future<OAuthCredential?> _loginWithGoogle() async {
try {
final GoogleSignInAccount? account = await GoogleSignIn(scopes: ['email']).signIn();
if (account != null) {
// Obtain the auth details from the request
final GoogleSignInAuthentication googleAuth = await account.authentication;
return GoogleAuthProvider.credential(
accessToken: googleAuth.accessToken,
idToken: googleAuth.idToken,
);
}
return null;
} catch (e) {
print(e);
return null;
}
}
Future<void> _logOut() async {
final List<UserInfo> data = _currentUser!.providerData;
String providerId = "firebase";
for (final item in data) {
if (item.providerId != "firebase") {
providerId = item.providerId;
break;
}
}
await _auth.signOut();
setState(() {});
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Container(
width: double.infinity,
height: double.infinity,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
if (!_fetching && _currentUser == null)
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
TextButton(
onPressed: () => _login(LoginType.facebook),
child: Text("FACEBOOK"),
),
SizedBox(width: 10),
TextButton (
onPressed: () => _login(LoginType.google),
child: Text("GOOGLE"),
),
],
),
if (_fetching) CircularProgressIndicator(),
if (_currentUser != null) ...[
Text("HI ...."),
Text(_currentUser!.displayName ??" "),
SizedBox(height: 20),
TextButton(
onPressed: _logOut,
child: Text("LOG OUT"),
),
]
],
),
),
),
);
}
}
how to solve this? i follow all instruction properly.