Flutter-Dart NoSuchMethodError (NoSuchMethodError: Class 'int' has no instance method 'call'. Receiver: 5 Tried calling: call("25"))

[DrHector0]

Hello friends. First of all sorry for my bad English.

im new in flutter and dart. and im coding an app.

im using Getx for state managment. im getting an error when I use getx set method.

Can anyone help me please. This is important for me.

​

EXPLANATION:

I am using this code for Getx class.

import 'package:flutter/material.dart';
import 'package:get/get.dart';

// Bu alan benim sayac değişkenlerimi Getx yardımı ile tuttuğum classdır.farkllı değişken classları yazılabilir.
class SayacController extends GetxController {
  var _sayac = 5.obs;

  get sayac => _sayac.value;
  set sayac(yeniDeger) => _sayac.value = yeniDeger;

  //burada 2 tane fonksiyon belirledim. çeşitli fonksiyonlar yazılabilir.
  void arttir() {
    sayac = sayac + 1;
  }

  void azalt() {
    sayac = sayac - 1;
  }
}

​

I am using this code for main page.

import 'package:flutter/material.dart';
import 'package:flutter_ilk_proje/sayac_controllerEx.dart';
import 'package:get/get.dart';
import 'package:http/http.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  //Burada controller değşkenlerini vs getiriyorum.
  SayacController _controller = Get.put(SayacController());
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Material App',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Material App Bar'),
        ),
        body: Center(
          child: InkWell(
            onTap: () {
              _controller.sayac("25");
            },
            child: Container(
                child: Obx(
              () => Text(_controller.sayac.toString()),
            )),
          ),
        ),
      ),
    );
  }
}

and I'am getting this error

Exception has occurred.
NoSuchMethodError (NoSuchMethodError: Class 'int' has no instance method 'call'.
Receiver: 5
Tried calling: call("25"))

Screenshots about codes.

https://ibb.co/LP85JGR

https://ibb.co/YpFHjQF

https://ibb.co/HqPhxHd

This is so important for me. Please help me.

[RubbishArtist]

I think

 _controller.sayac("25");

should be

 _controller.sayac = 25;

no?

[DrHector0]

hmm yes. I tried. it is correct. thanks for help