Windows Build Fails on Custom Flutter branch

[drexhacker]

Here is my flutter doctor -v output

[!] Flutter (Channel unknown, 3.10.6, on Microsoft Windows [Version 10.0.19045.2965], locale en-UG)
    ! Flutter version 3.10.6 on channel unknown at C:\flutter
      Currently on an unknown channel. Run `flutter channel` to switch to an official channel.
      If that doesn't fix the issue, reinstall Flutter by following instructions at
      https://flutter.dev/docs/get-started/install.
    ! Unknown upstream repository.
      Reinstall Flutter by following instructions at https://flutter.dev/docs/get-started/install.
    • Framework revision f468f3366c (5 months ago), 2023-07-12 15:19:05 -0700
    • Engine revision cdbeda788a
    • Dart version 3.0.6
    • DevTools version 2.23.1
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to
      perform update checks and upgrades.

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

[X] Android toolchain - develop for Android devices
    X Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.


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

[√] Visual Studio - develop for Windows (Visual Studio Community 2022 17.8.2) 
    • Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
    • Visual Studio Community 2022 version 17.8.34322.80
    • Windows 10 SDK version 10.0.22621.0

[!] Android Studio (not installed)
    • Android Studio not found; download from https://developer.android.com/studio/index.html
      (or visit https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions).

[√] VS Code (version 1.84.2)
    • VS Code at C:\Users\Cybroid Techologies\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.78.0

[√] Connected device (3 available)
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Version 10.0.19045.2965]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 120.0.6099.62
    • Edge (web)        • edge    • web-javascript • Microsoft Edge 92.0.902.67

[√] Network resources
    • All expected network resources are available.

! Doctor found issues in 3 categories.

I switched to an old version of flutter 3.10.6 this was necessary because the app am developing was failing to run on the client's PC when I was on flutter 3.16.0 and by that time this package was working well.
After the downgrade I started facing this issue

Unhandled exception:
Null check operator used on a null value
#0      FlutterVersion.isGreaterOrEqual (package:flutter_app_builder/src/commands/flutter.dart:47:55)
#1      BuildWindowsResult.outputDirectory (package:flutter_app_builder/src/builders/windows/build_windows_result.dart:58:25)#2      BuildResult.toJson (package:flutter_app_builder/src/build_result.dart:20:26)
#3      FlutterDistributor.package (package:flutter_distributor/src/flutter_distributor.dart:160:68)
<asynchronous suspension>
#4      CommandRunner.runCommand (package:args/command_runner.dart:212:13)
<asynchronous suspension>

As a workaround I managed to fix it temporalily by hardcoding the flutterVersion

// package:flutter_app_builder/src/commands/flutter.dart:47:55
...
  bool isGreaterOrEqual(String versionString) {
    // just keep the first part of the version string
    // final String currentVersionString = flutterVersion!.split('-').first;
    final String currentVersionString = "3.10.6"; // Temporalily Hard Code the Version
    final Version currentVersion = Version.parse(currentVersionString);
    return currentVersion.compareTo(Version.parse(versionString)) >= 0;
  }
...

Note: - Am using the latest flutter_distributor version 0.3.6.