Not signing up

[Aravindpr11]

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Null check operator used on a null value
E/flutter ( 6983): #0 _SignupState._signUp (package:dialogico/home/signup.dart:38:30)
E/flutter ( 6983): #1 _InkResponseState.handleTap (package:flutter/src/material/ink_well.dart:1183:21)
E/flutter ( 6983): #2 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:275:24)
E/flutter ( 6983): #3 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:652:11)
E/flutter ( 6983): #4 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:309:5)
E/flutter ( 6983): #5 BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:279:7)
E/flutter ( 6983): #6 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:167:27)
E/flutter ( 6983): #7 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:492:20)
E/flutter ( 6983): #8 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:468:22)
E/flutter ( 6983): #9 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:439:11)
E/flutter ( 6983): #10 GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:413:7)
E/flutter ( 6983): #11 GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:376:5)
E/flutter ( 6983): #12 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:323:7)
E/flutter ( 6983): #13 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:292:9)
E/flutter ( 6983): #14 _invoke1 (dart:ui/hooks.dart:328:13)
E/flutter ( 6983): #15 PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:410:7)
E/flutter ( 6983): #16 _dispatchPointerDataPacket (dart:ui/hooks.dart:262:31)
E/flutter ( 6983):

This is happening when i click signup

[Aravindpr11]

import 'package:cloud_functions/cloud_functions.dart';
import 'package:dialogico/app.dart';
import 'package:dialogico/screens/homescreen.dart';
import 'package:firebase_auth/firebase_auth.dart' as firebase;
import 'package:flutter/material.dart';
import 'package:stream_chat_flutter_core/stream_chat_flutter_core.dart';

void main(){
runApp(MaterialApp(home: Signup(),));
}
class Signup extends StatefulWidget {
static Route get route => MaterialPageRoute(
builder: (context) => Signup(),
);

@OverRide
State createState() => _SignupState();
}

class _SignupState extends State {
final auth = firebase.FirebaseAuth.instance;
final functions = FirebaseFunctions.instance;

final _formKey = GlobalKey();
final _nameController = TextEditingController();
final _profilePictureController = TextEditingController();
final _emailController = TextEditingController();
final _passwordController = TextEditingController();

final emailRegex = RegExp(
r"^[a-zA-Z0-9.a-zA-Z0-9.!#$%&'*+-/=?^`{|}~]+@[a-zA-Z0-9]+.[a-zA-Z]+");

bool _loading = false;

Future _signUp() async {
if (_formKey.currentState!.validate()) {
setState(() {
_loading = true;
});
try {
// Authenticate with Firebase
final creds =
await firebase.FirebaseAuth.instance.createUserWithEmailAndPassword(
email: _emailController.text,
password: _passwordController.text,
);
final user = creds.user;

    // Debugging: Print user information
    print('User: $user');

    // Move the 'mounted' check here
    if (mounted) {
      if (user == null) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('User is empty')),
        );
        return;
      }
    }

    // Set Firebase display name and profile picture
    List<Future<void>> futures = [
      creds.user!.updateDisplayName(_nameController.text),
      if (_profilePictureController.text.isNotEmpty)
        creds.user!.updatePhotoURL(_profilePictureController.text)
    ];

    await Future.wait(futures);

    // Create Stream user and get token using Firebase Functions
    final results = await functions
        .httpsCallable('ext-auth-chat-getStreamUserToken')
        .call();

    // Connect user to Stream and set user data
    if (!mounted) return;
    final client = StreamChatCore.of(context).client;
    final streamUser = User(
      id: creds.user!.uid,
      name: _nameController.text,
      image: _profilePictureController.text,
    );
    await client.connectUser(
      streamUser,
      results.data,
    );
    await client.updateUser(streamUser);

    if (!mounted) return;
    // Navigate to home screen
    await Navigator.of(context).pushReplacement(HomeScreen.route);
  } on firebase.FirebaseAuthException catch (e) {
    print('Firebase Auth Error: ${e.message}');
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text(e.message ?? 'Auth error')),
    );
  } catch (e, st) {
    print('Error: $e');
    print('Stack Trace: $st');
    logger.e('Sign up error', error: e, stackTrace: st);
    ScaffoldMessenger.of(context).showSnackBar(
      const SnackBar(content: Text('An error occurred')),
    );
  }

  setState(() {
    _loading = false;
  });
}

}

String? _nameInputValidator(String? value) {
if (value == null || value.isEmpty) {
return 'Cannot be empty';
}
return null;
}

String? _emailInputValidator(String? value) {
if (value == null || value.isEmpty) {
return 'Cannot be empty';
}
if (!_emailRegex.hasMatch(value)) {
return 'Not a valid email';
}
return null;
}

String? _passwordInputValidator(String? value) {
if (value == null || value.isEmpty) {
return 'Cannot be empty';
}
if (value.length <= 6) {
return 'Password needs to be longer than 6 characters';
}
return null;
}

@OverRide
void dispose() {
_emailController.dispose();
_passwordController.dispose();
_profilePictureController.dispose();
_nameController.dispose();
super.dispose();
}

@OverRide
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Color(0xfFE343333),
// appBar: AppBar(title: Text("Sign Up",style: TextStyle(color: Colors.white),
// ),backgroundColor: Color(0xfFE343333), ),
body: (_loading)
? const Center(child: CircularProgressIndicator())
: SingleChildScrollView(
child: Center(
child: Column(
children: [
SizedBox(height: 70,),

              Image.asset("assets/images/message-EaIj2A4c02.png",height: 100,width: 100,fit: BoxFit.fill,),

              SizedBox(height: 5,),


              Center(child: Text("Sign UP Here",style: TextStyle(color: Colors.white,fontWeight: FontWeight.bold,fontSize: 15),),),

              SizedBox(height: 5,),

Padding(padding: EdgeInsets.symmetric(horizontal: 20, vertical: 5),
child: TextFormField(
  controller: _nameController,
validator: _nameInputValidator,
style: TextStyle(color: Colors.white),
textInputAction: TextInputAction.next,
    decoration: InputDecoration(
        border: OutlineInputBorder(
            borderRadius: BorderRadius.circular(30)
        ),
        hintText: " Name",


        hintStyle: TextStyle(color: Colors.white,)
    ),
  keyboardType: TextInputType.name,
autofillHints: const [
  AutofillHints.name,
  AutofillHints.username
],
)),

          Padding(
            padding: const EdgeInsets.all(8.0),
            child: TextFormField(
              controller: _profilePictureController,
              style: TextStyle(color: Colors.white),
              textInputAction: TextInputAction.next,
              decoration:
               InputDecoration(
                  border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(30)
                  ),
                  hintText: " Image url",


                  hintStyle: TextStyle(color: Colors.white,)
              ),
              keyboardType: TextInputType.url,
            )),


              // Padding(padding: EdgeInsets.symmetric(horizontal: 20, vertical: 5),
              //     child: TextFormField(
              //         style: TextStyle(color: Colors.white),
              //         textInputAction: TextInputAction.next,
              //         decoration: InputDecoration(
              //             border: OutlineInputBorder(
              //                 borderRadius: BorderRadius.circular(30)
              //             ),
              //             hintText: "Last name",
              //             hintStyle: TextStyle(color: Colors.white,)
              //         ))),






              Padding(padding: EdgeInsets.symmetric(horizontal: 20, vertical: 5),
              child: TextFormField(
                style: TextStyle(color: Colors.white),
                textInputAction: TextInputAction.next,
                controller: _emailController,
                validator: _emailInputValidator,
                decoration: InputDecoration(
                    border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(30)
                    ),
                    hintText: "Email",
                  hintStyle: TextStyle(color: Colors.white,)

                ),
                keyboardType: TextInputType.emailAddress,
                autofillHints: const [AutofillHints.email],
              ),
              ),
              SizedBox(height: 5,),


              // Padding(padding: EdgeInsets.symmetric(horizontal: 20, vertical: 5),
              // child: TextFormField(
              //   style: TextStyle(color: Colors.white),
              //   textInputAction: TextInputAction.next,
              //   validator: (email){
              //     if(email!.isEmpty || email.contains("@")){
              //       return"Enter a valid eamil id";
              //     }
              //     else return null;
              //   },
              //   decoration: InputDecoration(
              //     border: OutlineInputBorder(
              //       borderRadius: BorderRadius.circular(30)
              //     ),
              //     hintText: "Email id ",
              //     hintStyle: TextStyle(color: Colors.white,)
              //   ),
              // ),
              // ),
              Padding(padding: EdgeInsets.symmetric(horizontal: 20, vertical: 5),
                child: TextFormField(
                    controller: _passwordController,
                    validator: _passwordInputValidator,
                  obscuringCharacter: "*",
                  decoration: InputDecoration(
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(30)
                    ),
                    hintText: "Password",
                      hintStyle: TextStyle(color: Colors.white,),

                  ),
                  obscureText: true,
                  enableSuggestions: false,
                  autocorrect: false,
                  keyboardType: TextInputType.visiblePassword,
                ),
              ),
              // Padding(padding: EdgeInsets.symmetric(horizontal: 20, vertical: 5),
              //   child: TextFormField(
              //     obscureText: showpwd1,
              //     obscuringCharacter: "*",
              //     decoration: InputDecoration(
              //       border: OutlineInputBorder(
              //           borderRadius: BorderRadius.circular(30)
              //       ),
              //       hintText: "Conform Password",
              //       hintStyle: TextStyle(color: Colors.white,),
              //
              //       suffixIcon: IconButton(onPressed: (){
              //         setState(() {
              //           if(showpwd1==true){
              //             showpwd1 = false;
              //           }
              //           else{
              //             showpwd1 = true;
              //           }
              //         });
              //       }, icon: Icon(showpwd1 == true?Icons.visibility:Icons.visibility_off,color: Colors.white,)),
              //     ),
              //     validator: (cpassword){
              //       if(cpassword != confirmpass || cpassword!.isEmpty){
              //         return"password mismatch / empty";
              //       }
              //       else return null;
              //     },
              //
              //   ),
              // ),
              SizedBox(height: 10,),
              ElevatedButton(
                onPressed: _signUp,
                child: const Text('Sign up'),
              ),
              const Padding(
                padding: EdgeInsets.symmetric(vertical: 16.0),
                child: Divider(),
              ),
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Text('Already have an account?'),
                      // style: TextStyle(fontStyle: font),
                   SizedBox(width: 8),
                  TextButton(
                    onPressed: () {
                      Navigator.of(context).pop();
                    },
                    child: const Text('Sign in'),
                  ),
                ],
              ),




            ],

                ),
        ),
      ),


);

}
}
this is my signup code