Exception caught by gesture when trying login - Flutter, firebase, Getx

[manarbajafar]

I am developing a app with Flutter and i using sign in with email/password by firebase- and i got this error when I clicked my login button, ════════ Exception caught by gesture ═══════════════════════════════════════════ type 'Null' is not a subtype of type 'AuthController' in type cast ════════════════════════════════════════════════════════════════════════════════:

This is my login_page.dart
`
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:shaghaf_app/screens/homepage.dart';

import '../controllers/auth_controller.dart';
import '../widgets/custom_button.dart';
import '../widgets/custom_textForm.dart';

class Login extends GetWidget {
final GlobalKey _formKey = GlobalKey();

@OverRide
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: const Color(0xffF6F2FA),
elevation: 0.0,
centerTitle: true,
title: Text(
"تسجيل الدخول",
style: Theme.of(context).textTheme.titleMedium,
),
),
body: SingleChildScrollView(
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 25, vertical: 16),
child: Form(
key: _formKey,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.end,
children: [
Text(
"مرحبا بك",
style: Theme.of(context).textTheme.titleLarge,
),
Text(
"الرجاء إدخال عنوان البريد الإلكتروني وكلمة المرور لتسجيل الدخول",
style: Theme.of(context).textTheme.bodySmall),
CustomTextFormField(
hintText: "البريد الإلكتروني",
onSaved: (value) {
controller.email = value;
},
validator: (value) {
if (!controller.isEmail(value)) {
print("error");
}
},
),
CustomTextFormField(
hintText: "كلمة المرور",
onSaved: (value) {
controller.password = value;
},
validator: (value) {
if (value == null) {
print("error");
}
},
),
CustomButton(
text: "تسجيل الدخول",
onPressed: () {
_formKey.currentState!.save();
if (_formKey.currentState!.validate()) {
controller.login();
}
},
),
const SizedBox(
height: 30,
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
const Text(
"لا تملك حساب؟",
style: TextStyle(color: Color(0xFF868D95)),
),
GestureDetector(
onTap: () {},
child: Text(
"سجل الآن",
style: Theme.of(context).textTheme.titleSmall,
),
)
],
)
],
),
),
),
),
);
}
}
`
AuthController.dart:

`import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';

import '../screens/homepage.dart';

class AuthController extends GetxController {
FirebaseAuth _auth = FirebaseAuth.instance;
late String email, password;

@OverRide
void onInit() {
// TODO: implement onInit
super.onInit();
}

@OverRide
void onReady() {
// TODO: implement onReady
super.onReady();
}

@OverRide
void onClose() {
// TODO: implement onClose
super.onClose();
}

Future login() async {
try {
await _auth.signInWithEmailAndPassword(
email: email.trim(), password: password.trim());
Get.offAll(Homepage());
} on FirebaseAuthException catch (e) {
print(e.message);
Get.snackbar("خطأ في تسجيل الدخول", e.message!,
colorText: Colors.black, snackPosition: SnackPosition.BOTTOM);
}
}

bool isEmail(String email) {
String p =
r"^[a-zA-Z0-9.a-zA-Z0-9.!#$%&'*+-/=?^_{|}~]+@[a-zA-Z0-9]+\.[a-zA-Z]+"; RegExp regExp = new RegExp(p); print(regExp.hasMatch(email)); return regExp.hasMatch(email); } }
and main.dart

`import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:shaghaf_app/auth.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:shaghaf_app/helper/binding.dart';
import 'screens/homepage.dart';
import 'screens/login.dart';
import 'screens/signup.dart';

void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp());
}

class MyApp extends StatelessWidget {
@OverRide
Widget build(BuildContext context) {
return GetMaterialApp(
initialBinding: Binding(),
debugShowCheckedModeBanner: false,
title: 'shaghaf',
theme: ThemeData(
backgroundColor: const Color(0xffF6F2FA),
fontFamily: 'Tajawal',
primaryColor: const Color(0xFF030865),
textTheme: const TextTheme(
titleMedium: TextStyle(
fontSize: 18,
fontWeight: FontWeight.bold,
color: Color(0xFF030865),
),
titleLarge: TextStyle(
fontSize: 25,
fontWeight: FontWeight.w900,
color: Color(0xFF030865),
),
bodySmall: TextStyle(
color: Color(0xFF868D95),
fontFamily: 'Poppins',
fontSize: 14,
),
titleSmall: TextStyle(
decoration: TextDecoration.underline,
fontFamily: 'Poppins',
fontSize: 16,
fontWeight: FontWeight.bold,
),
),
),
// home: const Auth(),
routes: {
'/': ((context) => const Auth()),
'homepagescreen': ((context) => Homepage()),
'signupscreen': ((context) => const Signup()),
'loginscreen': ((context) => Login())
},
);
}
}
`

binding.dart

`import 'package:get/get.dart';

import '../controllers/auth_controller.dart';

class Binding extends Bindings {
@OverRide
void dependencies() {
Get.lazyPut(() => AuthController);
}
}
`

my code is connected to firebase and i set formKey to my form, any suggestions?