flutter: child isn't defined - flutter

Question

I'm having trouble in an attempt to add an child but idk why doesn't work unless something is wrong with my numberform.dart
TextFormField(
controller: numteamController,
validator: (value) {
if (value!.isEmpty) {
return "Enter Valid Number";
} else {
return null;
}
},
child: NumberForm(
text: "Team Number",
formText: "Enter team number",
padding: 0,
)
),
numberform.dart
import 'package:flutter/material.dart';
class NumberForm extends StatelessWidget {
const NumberForm(
{Key? key,
required this.text,
required this.formText,
required this.padding,
required TextFormField child})
: super(key: key);
final String formText;
final String text;
final double padding;
#override
Widget build(BuildContext context) {
return Column(
children: [
SizedBox(
height: padding,
),
Align(
alignment: Alignment.topLeft,
child: Padding(
padding: const EdgeInsets.only(bottom: 10.0, left: 30),
child: Text(
text,
style: const TextStyle(
fontFamily: "Oxygen",
fontWeight: FontWeight.bold,
color: Colors.black,
fontSize: 20,
),
),
),
),
Padding(
padding: const EdgeInsets.only(bottom: 10.0, right: 30, left: 30),
child: TextFormField(
decoration: InputDecoration(
labelText: formText,
fillColor: Colors.white,
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
borderSide: const BorderSide(),
),
//fillColor: Colors.green
),
keyboardType: TextInputType.number,
style: const TextStyle(
fontFamily: "Poppins",
),
),
),
],
);
}
},

Answer 1

Here you have to know some basic things
TextFormField doesn't have child property.
Why are using TextFormField child in NumberForm if you are not using it.
you can use NumberForm like the below code.
#override
Widget build(BuildContext context) {
return const NumberForm(
text: "Team Number",
formText: "Enter team number",
padding: 0,
);
}

Answer 2

child: NumberForm(
text: "Team Number",
formText: "Enter team number",
padding: 0,
child: TextFormField,//add the textformfield here
)
In the numberForm class you have mentioned that a child is required but in the above codea child is missing. Add a key child:null in the above code.