isLoggedIn method does not work in Flutter 3.7

[hosseinvejdani]

The isLoggedIn method does not work and does not return anything. It doesn't even return an error! I try to use it like this:

  Future<bool> launchPurchaseFlow() async {

    bool success = false;

    try {
      bool? isLoggedIn = await _bazaar.isLoggedIn();
      if (isLoggedIn == null || isLoggedIn == false) {
        _showProperMessage(isLoggedIn);
        return success;
      } else {
        final PurchaseInfo? purchaseInfo = await inapp.purchase(AppConfig.productSKU, payLoad: "payLoad");
        if (purchaseInfo != null) {
          success = await _getPurchaseAtBazaar();
        }
      }
    } catch (e) {
      _showCafeBazaarErrorState();
    }

    return success;
  }

And this is my Flutter doctor -v results:

PS C:\Users\hossein\projects\flutter\haazerr> Flutter doctor -v   
[√] Flutter (Channel stable, 3.7.0, on Microsoft Windows [Version 10.0.19044.2604], locale en-US)
    • Flutter version 3.7.0 on channel stable at C:\src\flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision b06b8b2710 (5 weeks ago), 2023-01-23 16:55:55 -0800
    • Engine revision b24591ed32
    • Dart version 2.19.0
    • DevTools version 2.20.1

[√] Windows Version (Installed version of Windows is version 10 or higher)

[√] Android toolchain - develop for Android devices (Android SDK version 33.0.1)
    • Android SDK at C:\Users\hossein\AppData\Local\Android\sdk
    • Platform android-33-ext4, build-tools 33.0.1
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 11.0.15+0-b2043.56-9505619)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[X] Visual Studio - develop for Windows
    X Visual Studio not installed; this is necessary for Windows development.
      Download at https://visualstudio.microsoft.com/downloads/.
      Please install the "Desktop development with C++" workload, including all of its default components

[√] Android Studio (version 2022.1)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.15+0-b2043.56-9505619)

[√] VS Code (version 1.75.1)
    • VS Code at C:\Users\hossein\AppData\Local\Programs\Microsoft VS Code       
    • Flutter extension version 3.58.0

[√] Connected device (4 available)
    • sdk gphone64 x86 64 (mobile) • emulator-5554 • android-x64    • Android 12 (API 31) (emulator)
    • Windows (desktop)            • windows       • windows-x64    • Microsoft Windows [Version 10.0.19044.2604]
    • Chrome (web)                 • chrome        • web-javascript • Google Chrome 110.0.5481.177
    • Edge (web)                   • edge          • web-javascript • Microsoft Edge 110.0.1587.50

[√] HTTP Host Availability
    • All required HTTP hosts are available

! Doctor found issues in 1 category.