Error To show Data Parsed Json In Flutter - json

Question

I Have One Http Post Method Like This :
class ApiClientController extends GetxController {
Future<GetSideMenuInfoError?> GetInfoAfterLogin() async {
String? value = await storage.read(key: 'skey');
try {
final response = await dio.post(
Constant.baseUrl,
options: Options(
headers: {
"omax-apikey": "apikey",
},
),
data: {
"function": "portal_get_information",
"params": {
"portal_version": "1.0.0",
"portal_os": "linux",
"portal_os_version": "10",
"portal_browser": "chrome",
"portal_guid": "fd298776-6014-11ed-adbc-5256454165"
}
},
);
//print(response.data.toString());
GetSideMenuInfoError? responseBody = getSideMenuInfoErrorFromJson(response.data.toString());
return responseBody;
} on DioError catch (e) {
//return ;
print(e);
}
return null;
//IMPLEMENT USER LOGIN
}
}
And The Result Post Method My Json :
{
"result": 55456465,
"data": {
"reason": "session expired or not valid",
"uuid": "01dfca14-625559-11ed-aafa-0056546546"
}
}
Used This https://app.quicktype.io/ for Parsed Json To dart File Result Like This:
import 'package:meta/meta.dart';
import 'dart:convert';
GetSideMenuInfoError? getSideMenuInfoErrorFromJson(String str) => GetSideMenuInfoError?.fromJson(json.decode(str));
class GetSideMenuInfoError {
GetSideMenuInfoError({
#required this.result,
#required this.data,
});
final int? result;
final Data? data;
factory GetSideMenuInfoError.fromJson(Map<String, dynamic> json) => GetSideMenuInfoError(
result: json["result"],
data: Data.fromJson(json["data"]),
);
}
class Data {
Data({
#required this.reason,
#required this.uuid,
});
final String? reason;
final String? uuid;
factory Data.fromJson(Map<String, dynamic> json) => Data(
reason: json["reason"],
uuid: json["uuid"],
);
}
And My Question Is : How Can I Show value in Dart File Like reason or uuid In Other Class ?
My Way like This in Other Class And Not Worked:
In The Build Widget :
final apiClientController = Get.find<ApiClientController>();
apiClientController.GetInfoAfterLogin();
GetSideMenuInfoError? getSideMenuInfoError;
title: getSideMenuInfoError != null ?
Text(getSideMenuInfoError.result.toString()):Text('',),
Thank You For Helping Me...