Custom Widget Has Errors (Boilerplate Code)

I am having trouble to get the boilerplate code provided to work for a Custom Widget.

I go to the widget settings panel on the side and I copy the boilerplate code to the editor using the "Copy to Editor" button and when I compile the widget it says "Has Errors". When I click on the "Has Errors" button I am presented with a blank pop-up.

Any suggestions or guidance would be appreciated.

Bellow is the boilerplate code:

// Automatic FlutterFlow imports
import '/backend/backend.dart';
import '/flutter_flow/flutter_flow_theme.dart';
import '/flutter_flow/flutter_flow_util.dart';
import '/custom_code/widgets/index.dart'; // Imports other custom widgets
import '/flutter_flow/custom_functions.dart'; // Imports custom functions
import 'package:flutter/material.dart';
// Begin custom widget code
// DO NOT REMOVE OR MODIFY THE CODE ABOVE!

class NewCustomWidget extends StatefulWidget {
  const NewCustomWidget({
    Key? key,
    this.width,
    this.height,
  }) : super(key: key);

  final double? width;
  final double? height;

  @override
  _NewCustomWidgetState createState() => _NewCustomWidgetState();
}

class _NewCustomWidgetState extends State<NewCustomWidget> {
  @override
  Widget build(BuildContext context) {
    return Container();
  }
}