Bad state: No element

[joshua750]

I am try to running ios simulator getting this errror

import 'dart:io';
import 'package:file_manager/file_manager.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:path_provider/path_provider.dart';

class Pdflist extends StatefulWidget {
@OverRide
State createState() {
return _PdflistState();
}
}

class _PdflistState extends State {

@OverRide
void initState() {

super.initState();

permission();

}

Future permission() async {
await FileManager.requestFilesAccessPermission();
}
final FileManagerController controller = FileManagerController();
@OverRide
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("PDF File list from Storage"),
backgroundColor: Colors.redAccent,
),
body: FileManager(
controller: controller,
builder: (context, snapshot) {
final List entities = snapshot;
return ListView.builder(
itemCount: entities.length,
itemBuilder: (context, index) {
return Card(
child: ListTile(
leading: FileManager.isFile(entities[index])
? Icon(Icons.feed_outlined)
: Icon(Icons.folder),
title: Text(FileManager.basename(entities[index])),
onTap: () {
if (FileManager.isDirectory(entities[index])) {
controller.openDirectory(entities[index]); // open directory
} else {
// Perform file-related tasks.
}
},
),
);
},
);
},
),
);
}
}

Launching lib/main.dart on iPhone 11 in debug mode...
Running Xcode build...
Xcode build done. 32.8s
[VERBOSE-2:FlutterDarwinContextMetalImpeller.mm(35)] Using the Impeller rendering backend.
Debug service listening on ws://127.0.0.1:52812/3UHvPYDmDbM=/ws
Syncing files to device iPhone 11...
[VERBOSE-2:dart_vm_initializer.cc(41)] Unhandled Exception: Unsupported operation: Only Android is supported
#0 FileManager.requestFilesAccessPermission (package:file_manager/file_manager.dart:121:7)
#1 _PdflistState.permission (package:documentviewer/pdflist/Pdflist.dart:26:24)
#2 _PdflistState.initState (package:documentviewer/pdflist/Pdflist.dart:22:5)
#3 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:5219:55)
#4 ComponentElement.mount (package:flutter/src/widgets/framework.dart:5062:5)
#5 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3971:16)
#6 Element.updateChild (package:flutter/src/widgets/framework.dart:3708:18)
#7 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6435:14)
#8 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3971:16)
#9 Element.updateChild (package:flutter/src/widgets/framework.dart:3708:18)
#10 ComponentElement.performRebuild (pac<…>

======== Exception caught by widgets library =======================================================
The following StateError was thrown building FutureBuilder<List?>(dirty, state: _FutureBuilderState<List?>#75356):
Bad state: No element

The relevant error-causing widget was: