UserProfile crashes after auth.getCurrentUser() - flutter

Question

I am making an app in flutter an now when i try to show the user Name on the profile i got this error
════════ Exception caught by widgets library ═══════════════════════════════════
The following NoSuchMethodError was thrown building UserPage(dirty, dependencies: [MediaQuery], state: _UserProfile#ca57c):
The getter 'auth' was called on null.
Receiver: null
Tried calling: auth
The relevant error-causing widget was
UserPage
lib/HomePage.dart:92
When the exception was thrown, this was the stack
#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5)
#1 _UserProfile.build
package:tariffo/UserPage.dart:131
#2 StatefulElement.build
package:flutter/…/widgets/framework.dart:4619
#3 ComponentElement.performRebuild
package:flutter/…/widgets/framework.dart:4502
#4 StatefulElement.performRebuild
package:flutter/…/widgets/framework.dart:4675
...
═══════════════════════════════════════════════════════════════════════════════
and i used this code
FutureBuilder(
future:
Provider.of(context).auth.getCurrentUser(),
builder: (context, snapshot) {
if (snapshot.connectionState ==
ConnectionState.done) {
return Text("${snapshot.data.displayName}",
style: TextStyle(
color: Colors.black,
fontWeight: FontWeight.bold,
fontSize: 22,
));
} else {
return CircularProgressIndicator();
}
},
),
This is the code that i used for my auth.dart
import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'User.dart';
String email, name, photoUrl;
class Authentication {
final FirebaseAuth _firebaseAuth = FirebaseAuth.instance;
final GoogleSignIn _googleSignIn = GoogleSignIn();
Stream<String> get onAuthStateChanged => _firebaseAuth.onAuthStateChanged.map(
(FirebaseUser user) => user?.uid,
);
// GET UID
Future<String> getCurrentUID() async {
return (await _firebaseAuth.currentUser()).uid;
}
// GET CURRENT USER
Future getCurrentUser() async {
return await _firebaseAuth.currentUser();
}
// Email & Password Sign Up
Future<String> createUserWithEmailAndPassword(
String email, String password, String name) async {
final authResult = await _firebaseAuth.createUserWithEmailAndPassword(
email: email,
password: password,
);
// Update the username
await updateUserName(name, authResult.user);
return authResult.user.uid;
}
Future updateUserName(String name, FirebaseUser currentUser) async {
var userUpdateInfo = UserUpdateInfo();
userUpdateInfo.displayName = name;
await currentUser.updateProfile(userUpdateInfo);
await currentUser.reload();
}
// Email & Password Sign In
Future<String> signInWithEmailAndPassword(
String email, String password) async {
return (await _firebaseAuth.signInWithEmailAndPassword(
email: email, password: password))
.user
.uid;
}
// Sign Out
signOut() {
return _firebaseAuth.signOut();
}
// Reset Password
Future sendPasswordResetEmail(String email) async {
return _firebaseAuth.sendPasswordResetEmail(email: email);
}
// Create Anonymous User
Future singInAnonymously() {
return _firebaseAuth.signInAnonymously();
}
Future convertUserWithEmail(
String email, String password, String name) async {
final currentUser = await _firebaseAuth.currentUser();
final credential =
EmailAuthProvider.getCredential(email: email, password: password);
await currentUser.linkWithCredential(credential);
await updateUserName(name, currentUser);
}
Future convertWithGoogle() async {
final currentUser = await _firebaseAuth.currentUser();
final GoogleSignInAccount account = await _googleSignIn.signIn();
final GoogleSignInAuthentication _googleAuth = await account.authentication;
final AuthCredential credential = GoogleAuthProvider.getCredential(
idToken: _googleAuth.idToken,
accessToken: _googleAuth.accessToken,
);
await currentUser.linkWithCredential(credential);
await updateUserName(_googleSignIn.currentUser.displayName, currentUser);
}
// GOOGLE
Future<String> signInWithGoogle() async {
final GoogleSignInAccount account = await _googleSignIn.signIn();
final GoogleSignInAuthentication _googleAuth = await account.authentication;
final AuthCredential credential = GoogleAuthProvider.getCredential(
idToken: _googleAuth.idToken,
accessToken: _googleAuth.accessToken,
);
return (await _firebaseAuth.signInWithCredential(credential)).user.uid;
}
// APPLE
}
class NameValidator {
static String validate(String value) {
if (value.isEmpty) {
return "Name can't be empty";
}
if (value.length < 2) {
return "Name must be at least 2 characters long";
}
if (value.length > 50) {
return "Name must be less than 50 characters long";
}
return null;
}
}
class EmailValidator {
static String validate(String value) {
if (value.isEmpty) {
return "Email can't be empty";
}
return null;
}
}
class PasswordValidator {
static String validate(String value) {
if (value.isEmpty) {
return "Password can't be empty";
}
return null;
}
}
and this is the code for User.dart
import 'package:flutter/material.dart';
class User {
final String uid;
User({this.uid});
String adress;
bool business;
Map<String, dynamic> toJson() => {
'adress': adress,
'business': business,
};
}
Now it just appear a red background when i try to acces the profile page pressing the profile icon button
provider_widget.dart
import 'package:flutter/material.dart';
import 'auth.dart';
class Provider extends InheritedWidget {
final Authentication auth;
Provider({Key key, Widget child, this.auth}) : super(key: key, child: child);
#override
bool updateShouldNotify(InheritedWidget oldWidget) {
return true;
}
static Provider of(BuildContext context) =>
(context.inheritFromWidgetOfExactType(Provider) as Provider);
}