NoSuchMethodError: The method 'validate' was called on null.

[Mahmoud Alminawi]

Hello all, I am getting this error can you please help me.  [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: NoSuchMethodError: The method 'validate' was called on null.

E/flutter (13281): Receiver: null

E/flutter (13281): Tried calling: validate()

E/flutter (13281): #0      Object.noSuchMethod (dart:core-patch/object_patch.dart:50:5)

here is the code for the log in page 

import 'package:flutter/material.dart';

import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter_app_dating/pages/home.dart';

class LoginPage extends StatefulWidget {

  @override
  _LoginPageState createState( ) => _LoginPageState();



}

class _LoginPageState extends State<LoginPage> {
String _email, _password;
final GlobalKey<FormState> _formkey = GlobalKey<FormState>();
  @override
  Widget build(BuildContext context) {

    return Scaffold(


      appBar: AppBar(
        title: const Text('AppBar Ddemo'),
        actions: <Widget>[


        ],
      ),
      body:Form(

        child: Column(
          children: <Widget>[
            TextFormField(
              validator: (input){
                if(input.isEmpty){
                  return 'Please put you remai';
                }
                //return(input);
              },
              onSaved: (input) => _email = input ,
              decoration: InputDecoration(
                labelText: 'Email'
              ) ,
            ),

            TextFormField(
              autovalidate: (),
              validator: (input){
                if(input.length < 6){
                  return 'Please enter you r 6 or over passport';
                }
                //return(input);
              },
              onSaved: (input) => _password = input ,
              decoration: InputDecoration(
                  labelText: 'Enter you rpass'
              ) ,
              obscureText: true,
            ),
            RaisedButton(


              onPressed:(){
                SizedBox(
                    child: Text('dfedc '),
                  height: 22,
                  width: 52,


                );

              },
              child: Text('sighn ic '),
            ),
            IconButton(
              icon:  Icon(Icons.info),
              onPressed:(){ signIn();
                // Do something
              },
            )
          ],
        ),

      ),
    );
  }


   Future<void> signIn() async{
    final formState1 = _formkey.currentState;

        if(formState1.validate()){
     formState1.save();



     }
    try{
      FirebaseUser user = await  FirebaseAuth.instance.signInWithEmailAndPassword(email: _email, password: _password);
      Navigator.push(context, MaterialPageRoute(builder: (context) => Home()         ));

    }catch(e){
      print(e.message);
    }

  }



}

HERE IS THE CODE FOR THE HOME PAGE IN A DIFFRENT DART FILE 

import 'package:flutter/material.dart';
class Home extends StatefulWidget {
  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<Home> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar:  AppBar(
        title: Text('Home'),
      ),
    );
  }
}








HERE IS THE CODE FOR THE MAIN FILe

import 'package:flutter/material.dart';
import 'package:flutter_app_dating/SetUp/Login.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demhho',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),

      home: LoginPage(),
    );
  }
}

[Gaurav Shetty]

You need add key to Form widget.
Form(key:_formkey)

[Oséias Silva]

Hello, about this problem, I have the same problem and not resolved. Help me please!

[Graham Dickinson]

Suggest you show us some code. The fix indicated in the previous post was correct for his code.

[Souvik Dutta]

You forgot to provide key inside the form in your login page. Just add this after you started the form widget.

key: _formkey, 

This should solve the problem.

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[Oséias Silva]

Is running ok, thanks!

[Souvik Dutta]

👍

On Thu, Apr 2, 2020, 6:28 PM Oséias Silva <10.o...@gmail.com> wrote:

Is running ok, thanks!

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[Salsabeela H]

 I have the same problem and not resolved. Help me please! 

بتاريخ الخميس، 2 أبريل، 2020 4:00:40 م UTC+3، كتب Souvik Dutta:

👍

On Thu, Apr 2, 2020, 6:28 PM Oséias Silva <10.o...@gmail.com> wrote:

Is running ok, thanks!

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[Souvik Dutta]

Salsabeela provide your code.

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