OS Error: Operation not permitted, errno = 1 when create folder in iOS in flutter app

When create a folder in iOS 15 operation system in flutter using this code:

Future<void> ensureInitialized() async {
    if (!kIsWeb) {
      final docDir = await getApplicationDocumentsDirectory();
      dataDirectory = Directory('${docDir.parent.path}/biyiapp-dev');
      if (!dataDirectory!.existsSync()) {
        dataDirectory!.createSync(recursive: true);
      }
      File sessionFile = File('${dataDirectory!.path}/session.json');
      if (sessionFile.existsSync()) {
        final String jsonString = await sessionFile.readAsString();
        lastSession = Session.fromJson(json.decode(jsonString));
      }
    }
  }

when I run this code in real device of iPhone XR, shows error message like this:

[12:27:49:427] [ERROR] {"error":"FileSystemException: Creation failed, path = '/var/mobile/Containers/Data/Application/9024BC3C-CA76-42A5-977E-FCA9BA191FA5/biyiapp-dev' (OS Error: Operation not permitted, errno = 1)","message":"global error","stackTrace":"#0      _Directory.createSync (dart:io/directory_impl.dart:133)\n#1      ProAccount.ensureInitialized (package:pro_account/src/pro_account.dart:35)\n<asynchronous suspension>\n#2      DictGlobalConfig.loadApp.<anonymous closure> (package:biyi_app/config/dict_global_config.dart:22)\n<asynchronous suspension>\n"}

what should I do to make the flutter app could create folder in iOS real device by default?