android – The strategy ‘_PayWallWidgetState’ is not outlined for the sort ‘PayWallWidget’

I wish to make an Paywallwidget however when i wish to make the paywallwidget state i get this error: The strategy ‘_PayWallWidgetState’ is not outlined for the sort ‘PayWallWidget’. What am i doing improper right here?

import 'package deal:glassfy_flutter/fashions.dart';
import 'package deal:flutter/materials.dart';
class PayWallWidget extends StatefulWidget {
  last String title;
  last String description;
  last GlassfyOffering provide;
  last ValueChanged<GlassfySku> onClickedSku;

  const PayWallWidget({
    Key? key,
    required this.title,
    required this.description,
    required this.provide,
    required this.onClickedSku,
  }) : tremendous(key: key);

  @override
  State<PayWallWidget> createState() => _PayWallWidgetState();
}