How to fix flutter web TextFormField not accepting nor responding to input?

I created this code snippet to create a login web form in flutter web application, in which I used TextFormField, it is displayed well but when I try to input any characters in this field, it doesn't respond and no input is taken, how can this be solved please?

class LoginForm extends StatefulWidget{

  @override
  LoginFormState createState(){
    return LoginFormState();
  }
}

class LoginFormState extends State<LoginForm>{

  final _formKey = GlobalKey<FormState>();



@override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Form(
      key: _formKey,
      child: Column(
        children: <Widget>[
Row(
              children: <Widget>[
                // Email input field
                Container(
                  width: 120.0,
                  child: Text(
                    "Email: *",
                    textAlign: TextAlign.left,
                    style: TextStyle(
                      color: Colors.black,
                      fontSize: 18.0,
                      fontWeight: FontWeight.w500,
                      fontFamily: 'Merriweather',
                    ),
                  ),
                ),
                SizedBox(width: 40.0,),
                Container(
                  width: MediaQuery.of(context).size.width / 4.0,
                  child: TextFormField(
                    keyboardType: TextInputType.emailAddress,
                    cursorColor: Colors.black,
                    style: TextStyle(
                      fontSize: 14.0,
                    ),
                    decoration: InputDecoration(
                      hintText: 'e@x.y',
                      contentPadding: EdgeInsets.all(10.0),
                      enabledBorder: UnderlineInputBorder(
                        borderSide: BorderSide(
                          color: Colors.black87,
                        ),
                        borderRadius: BorderRadius.circular(10.0),
                      ),
                    ),
                    validator: (value){
                      if(value.isEmpty){
                        return "Please enter your email!";
                      }
                      return "yayyy";
                    },
                  ),
                ),
              ]
          ),

Expected: user can enter input in the textFormfield Error: User can't enter any input and the scroll keep blinking only