My Error Image

class Home extends StatelessWidget {
  const Home({super.key});

  @override
  Widget build(BuildContext context) {
    return SafeArea(
      bottom: false,
      child: Scaffold(
        body: Stack(
          alignment: Alignment.topCenter,
          children: <Widget>[
            Container(
              decoration: BoxDecoration(color: Colors.white),
            ),
            Positioned(
              top: 86,
              bottom: 294,
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Image(
                    width: 104,
                    height: 112,
                    image: AssetImage('assets/images/rootinelogo.png'),
                  ),
                  SizedBox(
                    height: 24,
                  ),
                  Text(
                    'Rootine',
                    style: TextStyle(
                      fontFamily: 'Grandstander',
                      fontSize: 32,
                      fontWeight: FontWeight.bold,
                      color: Colors.black,
                    ),
                  ),
                  SizedBox(
                    height: 48,
                  ),
                  LoginForm(),
                ],
              ),
            )
          ],
        ),
      ),
    );
  }
}

class LoginForm extends StatefulWidget {
  const LoginForm({
    super.key,
  });

  @override
  State<LoginForm> createState() => _LoginFormState();
}

class _LoginFormState extends State<LoginForm> {
  final _formKey = GlobalKey<FormState>();
  TextEditingController emailController = TextEditingController();
  TextEditingController passwordController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Form(
      key: _formKey,
      child: Column(
        mainAxisSize: MainAxisSize.min,
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          Flexible(
            child: TextFormField(
              controller: emailController,
              decoration: InputDecoration(border: OutlineInputBorder(), labelText: 'Email'),
              validator: (value) {
                if (value == null || value.isEmpty) {
                  return 'Please enter your email';
                }
                return null;
              },
            ),
          ),
          Flexible(
            child: TextFormField(
              obscureText: true,
              controller: passwordController,
              decoration: InputDecoration(border: OutlineInputBorder(), labelText: 'Password'),
              validator: (value) {
                if (value == null || value.isEmpty) {
                  return 'Please enter your password';
                }
                return null;
              },
            ),
          ),
        ],
      ),
    );
  }
}

I wanted to build login page. Normally I build with just Column, and it is ok. But, now I used Stack Widget because I have some images to overlap in the page. Everything was fine until LoginForm class. After building LoginForm, the error was started and TextFormField didn’t appear. Although I couldn’t capture the errors because android debug logs kept running, I saw the errors are in Stack and Column widget from LoginForm. Please help me to fix the errors and guide me that how can I solve? Thank you.