Error: Method not found: 'webOnlySetPluginHandler'.

```
import 'package:flutter/material.dart';
import 'package:flutter_web_plugins/flutter_web_plugins.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';

class pdfView extends StatelessWidget {
@override
Widget build(BuildContext context) {
return WebviewScaffold(
appBar: AppBar(
title: Text("pdf"),
),
url: "http://www.nie.ac.in/wp-content/uploads/2015/05/I-Sc-Engg.-II-year-2019-20.pdf",
allowFileURLs: true,
withJavascript: true,
withZoom: true,
initialChild: Center(
child: CircularProgressIndicator(),
),
);
}
}

```