[Question] Need help with "flet build windows" error

[ryyHardy]

Question

I have a boilerplate Flet project I set up for a chess game I'm making using flet create. I also have the Flutter SDK installed and added to path, and the Visual Studio Build Tools 2022 installed with C++ Desktop Development checked. However, flet build windows doesn't seem to work for me despite having the requirements. I'll share the output I got below (using --verbose). Any idea on what the issue is and how to fix it?

Code sample

No response

Error message

(chess) C:\Dev\Personal\Projects\-REPOS\chess>flet build windows --verbose
[18:28:18] Run subprocess: ['C:\\Users\\ryyha\\dev\\flutter\\bin\\flutter.BAT',
           '--version', '--no-version-check', '--suppress-analytics']
[18:28:20] Ensure Flutter has desktop support enabled
           Run subprocess: ['C:\\Users\\ryyha\\flutter\\3.27.4\\bin\\flutter.bat',
           'config', '--no-version-check', '--suppress-analytics',
           '--enable-windows-desktop']
[18:28:21] Setting "enable-windows-desktop" value to "true".

           You may need to restart any open editors for them to read new settings.
           Flutter 3.27.4 installed ✅
           Flutter executable: C:\Users\ryyha\flutter\3.27.4\bin\flutter.bat
           Dart executable: C:\Users\ryyha\flutter\3.27.4\bin\dart.bat
[18:28:25] Created Flutter bootstrap project from gh:flet-dev/flet-build-template with
           ref "0.27.6" ✅
           Run subprocess: ['C:\\Users\\ryyha\\flutter\\3.27.4\\bin\\dart.bat', 'run',
           '--suppress-analytics', 'serious_python:main', 'package',
           'C:\\Dev\\Personal\\Projects\\-REPOS\\chess\\src', '--platform', 'Windows',
           '-r', 'flet==0.27.6', '--exclude', 'build', '--cleanup-packages']
[18:28:36] Running package command
           Extra PyPi indexes: [https://pypi.flet.dev]
           Creating asset directory:
           C:\Dev\Personal\Projects\-REPOS\chess\build\flutter\app
           Created temp directory:
           C:\Users\ryyha\AppData\Local\Temp\serious_python_temp2e8f3a91
           Copying Python app from C:\Dev\Personal\Projects\-REPOS\chess\src to a temp
           directory
           Configured Windows/ platform with sitecustomize.py
           Installing [flet==0.27.6] with pip command to
           C:\Dev\Personal\Projects\-REPOS\chess\build\site-packages
           Downloading Python distributive from
           https://github.com/astral-sh/python-build-standalone/releases/download/20250
           205/cpython-3.12.9+20250205-x86_64-pc-windows-msvc-shared-install_only_strip
           ped.tar.gz to a build directory
[18:28:39] Extracting Python distributive
[18:28:58] Cleanup installed packages
           Creating app archive at
           C:\Dev\Personal\Projects\-REPOS\chess\build\flutter\app/app.zip from a temp
           directory
           Writing app archive hash to
           C:\Dev\Personal\Projects\-REPOS\chess\build\flutter\app/app.zip.hash
           Deleting temp directory
           Packaged Python app ✅
[18:29:00] Run subprocess: ['C:\\Users\\ryyha\\flutter\\3.27.4\\bin\\dart.bat', 'run',
           '--suppress-analytics', 'flutter_launcher_icons']
[18:29:08]   ════════════════════════════════════════════
                FLUTTER LAUNCHER ICONS (v0.14.3)
             ════════════════════════════════════════════

           • Creating default icons Android
           • Overwriting the default Android launcher icon with a new icon
[18:29:09] • Creating adaptive icons Android
           • No colors.xml file found in your Android project
           • Creating colors.xml file and adding it to your Android project
           • Creating mipmap xml file Android
           • Overwriting default iOS launcher icon with new icon
[18:29:10] Creating Icons for Web...
[18:29:11] Creating Icons for Windows...
           Creating Icons for MacOS...
[18:29:12]
           ✓ Successfully generated launcher icons
           Generated app icons ✅
           Run subprocess: ['C:\\Users\\ryyha\\flutter\\3.27.4\\bin\\flutter.bat',
           'build', 'windows', '--no-version-check', '--suppress-analytics',
           '--build-name', '0.1.0']
[18:29:13] Resolving dependencies...
           Downloading packages...
[18:29:15]   archive 3.6.1 (4.0.5 available)
             characters 1.3.0 (1.4.0 available)
             clock 1.1.1 (1.1.2 available)
             collection 1.19.0 (1.19.1 available)
             device_info_plus 11.3.0 (11.3.3 available)
             ffi 2.1.3 (2.1.4 available)
             file_picker 8.3.7 (10.1.2 available)
             fl_chart 0.69.2 (0.71.0 available)
           ! flet 0.27.6 (overridden)
             flutter_lints 2.0.3 (5.0.0 available)
             flutter_native_splash 2.4.4 (2.4.6 available)
             image 4.3.0 (4.5.4 available)
             intl 0.19.0 (0.20.2 available)
             js 0.6.7 (0.7.2 available)
             lints 2.1.1 (6.0.0 available)
             material_color_utilities 0.11.1 (0.12.0 available)
             meta 1.15.0 (1.16.0 available)
             path 1.9.0 (1.9.1 available)
             petitparser 6.0.2 (6.1.0 available)
             sensors_plus 4.0.2 (6.1.1 available)
             sensors_plus_platform_interface 1.2.0 (2.0.1 available)
           ! serious_python 0.9.3 from git
           https://github.com/flet-dev/serious-python.git at 6c24e5 in
           src/serious_python (overridden)
             toml 0.15.0 (0.16.0 available)
             url_strategy 0.2.0 (discontinued)
             vector_math 2.1.4 (2.1.5 available)
           ! wakelock_plus 1.3.1 (overridden)
           ! web 1.1.1 (overridden)
             web_socket_channel 2.4.5 (3.0.3 available)
           ! webview_flutter_android 4.4.0 (overridden)
             win32 5.10.1 (5.12.0 available)
             win32_registry 1.1.5 (2.1.0 available)
           ! window_manager 0.4.3 (overridden)
           Got dependencies!
           1 package is discontinued.
           26 packages have newer versions incompatible with dependency constraints.
           Try `flutter pub outdated` for more information.

           windows/flutter/CMakeLists.txt does not use FLUTTER_TARGET_PLATFORM,
           updating.
[18:31:25] Building Windows application...
           C:\Program Files (x86)\Microsoft Visual
           Studio\2022\BuildTools\VC\Tools\MSVC\14.43.34808\include\format(42): warning
           STL4038: The contents of <format> are available only with C++20 or later.
           [C:\Dev\Personal\Projects\-REPOS\chess\build\flutter\build\windows\x64\plugi
           ns\serious_python_windows\serious_python_windows_plugin.vcxproj]
[18:31:44] C:\Program Files (x86)\Microsoft Visual
           Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets
           (166,5): error MSB3073: The command "setlocal
           [C:\Dev\Personal\Projects\-REPOS\chess\build\flutter\build\windows\x64\INSTA
           LL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual
           Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets
           (166,5): error MSB3073: "C:\Program Files (x86)\Microsoft Visual
           Studio\2022\BuildTools\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bi
           n\cmake.exe" -DBUILD_TYPE=Release -P cmake_install.cmake
           [C:\Dev\Personal\Projects\-REPOS\chess\build\flutter\build\windows\x64\INSTA
           LL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual
           Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets
           (166,5): error MSB3073: if %errorlevel% neq 0 goto :cmEnd
           [C:\Dev\Personal\Projects\-REPOS\chess\build\flutter\build\windows\x64\INSTA
           LL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual
           Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets
           (166,5): error MSB3073: :cmEnd
           [C:\Dev\Personal\Projects\-REPOS\chess\build\flutter\build\windows\x64\INSTA
           LL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual
           Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets
           (166,5): error MSB3073: endlocal & call :cmErrorLevel %errorlevel% & goto
           :cmDone
           [C:\Dev\Personal\Projects\-REPOS\chess\build\flutter\build\windows\x64\INSTA
           LL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual
           Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets
           (166,5): error MSB3073: :cmErrorLevel
           [C:\Dev\Personal\Projects\-REPOS\chess\build\flutter\build\windows\x64\INSTA
           LL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual
           Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets
           (166,5): error MSB3073: exit /b %1
           [C:\Dev\Personal\Projects\-REPOS\chess\build\flutter\build\windows\x64\INSTA
           LL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual
           Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets
           (166,5): error MSB3073: :cmDone
           [C:\Dev\Personal\Projects\-REPOS\chess\build\flutter\build\windows\x64\INSTA
           LL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual
           Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets
           (166,5): error MSB3073: if %errorlevel% neq 0 goto :VCEnd
           [C:\Dev\Personal\Projects\-REPOS\chess\build\flutter\build\windows\x64\INSTA
           LL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual
           Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets
           (166,5): error MSB3073: :VCEnd" exited with code 1.
           [C:\Dev\Personal\Projects\-REPOS\chess\build\flutter\build\windows\x64\INSTA
           LL.vcxproj]
           Building Windows application...                                   148.3s
           Build process failed.
           <_io.TextIOWrapper name=4 encoding='utf-8'>
           Run subprocess: ['C:\\Users\\ryyha\\flutter\\3.27.4\\bin\\flutter.bat',
           'doctor', '--no-version-check', '--suppress-analytics']
[18:31:48] Doctor summary (to see all details, run flutter doctor -v):
           [✓] Flutter (Channel stable, 3.27.4, on Microsoft Windows [Version
           10.0.26100.3775], locale en-US)
           [✓] Windows Version (Installed version of Windows is version 10 or higher)
           [✗] Android toolchain - develop for Android devices
               ✗ 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/to/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
           [✓] Visual Studio - develop Windows apps (Visual Studio Build Tools 2022
           17.13.6)
           [!] Android Studio (not installed)
           [✓] VS Code (version 1.99.3)
           [✓] Connected device (3 available)
           [✓] Network resources

           ! Doctor found issues in 2 categories.

╭─────────────────────────────────────────────────────────────────────────────────────╮
│ Error building Flet app - see the log of failed command above.                      │
╰─────────────────────────────────────────────────────────────────────────────────────╯

------------------------------------------------------

• I have searched for answers to my question both in the issues and in previous discussions.

[ap4499]

Did you find the cause of this?

MSB3073 is pretty unhelpful as an error code..

My first thoughts, it being Windows, would be permissions.. I'd go through the following steps just to rule them out:

1. Run the command from a terminal with admin permissions.
2. Clean out the Flet and Flutter caches (flet clean / flutter clean)
3. Make sure you have the correct Visual Studio Build Tools Components (CMake and the Windows SDK).
4. Have youtgot anything turned on, like drive protection, which is blocking access to any files/folders (ransomware protection), or even an antivirus tool?

Not especially helpful.. I feel like outsourced IT! But I am curious to know what the cause was..

[Orlangur777]

1.Try installing Android Studio. This is the only error in your log.
2.Try using other libraries to create exe. I had a similar problem and I used the Auto PY to EXE library. The size of the resulting exe file was even smaller than when creating through flet.

[ryyHardy]

So I tried what both of you suggested, and I am still running into problems with flet build. However, I did manage to get the project to build with PyInstaller so that's a good alternative for now. As for the issue behind it, ChatGPT seems to suspect some kind of CMake issue, but I'd take that with a grain of salt. Here's the output for the latest flet build windows --verbose if you're curious:

(chess) C:\Dev\Personal\Projects\REPOS\chess>flet build windows --verbose
[19:52:31] Run subprocess: ['C:\\Users\\ryyha\\dev\\flutter\\bin\\flutter.BAT', '--version', '--no-version-check', '--suppress-analytics']                     
[19:52:32] Ensure Flutter has desktop support enabled                                                                                                          
           Run subprocess: ['C:\\Users\\ryyha\\flutter\\3.27.4\\bin\\flutter.bat', 'config', '--no-version-check', '--suppress-analytics',                     
           '--enable-windows-desktop']                                                                                                                         
[19:52:33] Setting "enable-windows-desktop" value to "true".
           
           You may need to restart any open editors for them to read new settings.
           Flutter 3.27.4 installed ✅                                                                                                                         
           Flutter executable: C:\Users\ryyha\flutter\3.27.4\bin\flutter.bat
           Dart executable: C:\Users\ryyha\flutter\3.27.4\bin\dart.bat
[19:52:37] Created Flutter bootstrap project from gh:flet-dev/flet-build-template with ref "0.27.6" ✅                                                         
           Run subprocess: ['C:\\Users\\ryyha\\flutter\\3.27.4\\bin\\dart.bat', 'run', '--suppress-analytics', 'serious_python:main', 'package',               
           'C:\\Dev\\Personal\\Projects\\REPOS\\chess\\src', '--platform', 'Windows', '-r', 'flet==0.27.6', '--exclude', 'build', '--cleanup-packages']        
[19:52:50] Running package command
           Extra PyPi indexes: [https://pypi.flet.dev]
           Creating asset directory: C:\Dev\Personal\Projects\REPOS\chess\build\flutter\app
           Created temp directory: C:\Users\ryyha\AppData\Local\Temp\serious_python_tempd3486aac
           Copying Python app from C:\Dev\Personal\Projects\REPOS\chess\src to a temp directory
           Configured Windows/ platform with sitecustomize.py
           Installing [flet[all]==0.27.6] with pip command to C:\Dev\Personal\Projects\REPOS\chess\build\site-packages
           Downloading Python distributive from
           https://github.com/astral-sh/python-build-standalone/releases/download/20250205/cpython-3.12.9+20250205-x86_64-pc-windows-msvc-shared-install_only_s
           tripped.tar.gz to a build directory
[19:52:53] Extracting Python distributive
[19:53:44] Cleanup installed packages
[19:53:45] Creating app archive at C:\Dev\Personal\Projects\REPOS\chess\build\flutter\app/app.zip from a temp directory
           Writing app archive hash to C:\Dev\Personal\Projects\REPOS\chess\build\flutter\app/app.zip.hash
           Deleting temp directory
           Packaged Python app ✅                                                                                                                              
[19:53:48] Run subprocess: ['C:\\Users\\ryyha\\flutter\\3.27.4\\bin\\dart.bat', 'run', '--suppress-analytics', 'flutter_launcher_icons']                       
[19:53:58]   ════════════════════════════════════════════
                FLUTTER LAUNCHER ICONS (v0.14.3)
             ════════════════════════════════════════════

           • Creating default icons Android
[19:53:59] • Overwriting the default Android launcher icon with a new icon
           • Creating adaptive icons Android
           • No colors.xml file found in your Android project
           • Creating colors.xml file and adding it to your Android project
           • Creating mipmap xml file Android
           • Overwriting default iOS launcher icon with new icon
[19:54:00] Creating Icons for Web...
           Creating Icons for Windows...
           Creating Icons for MacOS...
[19:54:01] 
           ✓ Successfully generated launcher icons
           Generated app icons ✅                                                                                                                              
           Run subprocess: ['C:\\Users\\ryyha\\flutter\\3.27.4\\bin\\flutter.bat', 'build', 'windows', '--no-version-check', '--suppress-analytics',           
           '--build-name', '0.1.0']                                                                                                                            
[19:54:02] Resolving dependencies...
           Downloading packages...
[19:54:04]   archive 3.6.1 (4.0.6 available)
             characters 1.3.0 (1.4.0 available)
             clock 1.1.1 (1.1.2 available)
             collection 1.19.0 (1.19.1 available)
             device_info_plus 11.3.0 (11.3.3 available)
             ffi 2.1.3 (2.1.4 available)
             file_picker 8.3.7 (10.1.2 available)
             fl_chart 0.69.2 (0.71.0 available)
           ! flet 0.27.6 (overridden)
             flutter_lints 2.0.3 (5.0.0 available)
             flutter_native_splash 2.4.4 (2.4.6 available)
             image 4.3.0 (4.5.4 available)
             intl 0.19.0 (0.20.2 available)
             js 0.6.7 (0.7.2 available)
             lints 2.1.1 (6.0.0 available)
             material_color_utilities 0.11.1 (0.12.0 available)
             meta 1.15.0 (1.16.0 available)
             path 1.9.0 (1.9.1 available)
             petitparser 6.0.2 (6.1.0 available)
             sensors_plus 4.0.2 (6.1.1 available)
             sensors_plus_platform_interface 1.2.0 (2.0.1 available)
           ! serious_python 0.9.3 from git https://github.com/flet-dev/serious-python.git at 6c24e5 in src/serious_python (overridden)
             toml 0.15.0 (0.16.0 available)
             url_strategy 0.2.0 (discontinued)
             vector_math 2.1.4 (2.1.5 available)
           ! wakelock_plus 1.3.1 (overridden)
           ! web 1.1.1 (overridden)
             web_socket_channel 2.4.5 (3.0.3 available)
           ! webview_flutter_android 4.4.0 (overridden)
             win32 5.10.1 (5.12.0 available)
             win32_registry 1.1.5 (2.1.0 available)
           ! window_manager 0.4.3 (overridden)
           Got dependencies!
           1 package is discontinued.
           26 packages have newer versions incompatible with dependency constraints.
           Try `flutter pub outdated` for more information.
[19:54:05] 
           windows/flutter/CMakeLists.txt does not use FLUTTER_TARGET_PLATFORM, updating.
[19:56:25] Building Windows application...
           C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\VC\Tools\MSVC\14.43.34808\include\format(42): warning STL4038: The contents of       
           <format> are available only with C++20 or later.
           [C:\Dev\Personal\Projects\REPOS\chess\build\flutter\build\windows\x64\plugins\serious_python_windows\serious_python_windows_plugin.vcxproj]
[19:56:44] C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: The     
           command "setlocal [C:\Dev\Personal\Projects\REPOS\chess\build\flutter\build\windows\x64\INSTALL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073:
           "C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe"
           -DBUILD_TYPE=Release -P cmake_install.cmake [C:\Dev\Personal\Projects\REPOS\chess\build\flutter\build\windows\x64\INSTALL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: if      
           %errorlevel% neq 0 goto :cmEnd [C:\Dev\Personal\Projects\REPOS\chess\build\flutter\build\windows\x64\INSTALL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: :cmEnd  
           [C:\Dev\Personal\Projects\REPOS\chess\build\flutter\build\windows\x64\INSTALL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: endlocal
           & call :cmErrorLevel %errorlevel% & goto :cmDone [C:\Dev\Personal\Projects\REPOS\chess\build\flutter\build\windows\x64\INSTALL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073:
           :cmErrorLevel [C:\Dev\Personal\Projects\REPOS\chess\build\flutter\build\windows\x64\INSTALL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: exit /b 
           %1 [C:\Dev\Personal\Projects\REPOS\chess\build\flutter\build\windows\x64\INSTALL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: :cmDone 
           [C:\Dev\Personal\Projects\REPOS\chess\build\flutter\build\windows\x64\INSTALL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: if      
           %errorlevel% neq 0 goto :VCEnd [C:\Dev\Personal\Projects\REPOS\chess\build\flutter\build\windows\x64\INSTALL.vcxproj]
           C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: :VCEnd" 
           exited with code 1. [C:\Dev\Personal\Projects\REPOS\chess\build\flutter\build\windows\x64\INSTALL.vcxproj]
           Building Windows application...                                   159.0s
           Build process failed.
           <_io.TextIOWrapper name=4 encoding='utf-8'>                                                                                                         
           Run subprocess: ['C:\\Users\\ryyha\\flutter\\3.27.4\\bin\\flutter.bat', 'doctor', '--no-version-check', '--suppress-analytics']                     
[19:56:49] Doctor summary (to see all details, run flutter doctor -v):                                                                                         
           [√] Flutter (Channel stable, 3.27.4, on Microsoft Windows [Version 10.0.26100.3775], locale en-US)                                                  
           [√] Windows Version (Installed version of Windows is version 10 or higher)                                                                          
           [√] Android toolchain - develop for Android devices (Android SDK version 35.0.1)                                                                    
           [√] Chrome - develop for the web                                                                                                                    
           [√] Visual Studio - develop Windows apps (Visual Studio Build Tools 2022 17.13.6)                                                                   
           [√] Android Studio (version 2024.3)                                                                                                                 
           [√] VS Code (version 1.99.3)                                                                                                                        
           [√] Connected device (3 available)                                                                                                                  
           [√] Network resources                                                                                                                               

           • No issues found!                                                                                                                                  

╭─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ Error building Flet app - see the log of failed command above.                                                                                              │
╰─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯

[Orlangur777]

error MSB3073: The command "setlocal... exited with code 1. This indicates a failure while executing a CMake command during build. I suspect problems with Visual Studio Build Tools. The logs show that VS 2022 Build Tools (17.13.6) is used .

Try reinstall Visual Studio 2022 with components: "Desktop development with C++", Windows 10/11 SDK". Or update an existing installation via Visual Studio Installer/.

Check the build of the empty test project:

bash

flet create test_app
cd test_app
flet build windows

If the test project builds, the problem is in your project: check for non-standard dependencies

[ryyHardy]

I tried a couple more things in addition to what was suggested before:

1. Double-checked, repaired, and updated Visual Studio build tools with the components mentioned.
2. Reinstalled the Flutter SDK.
3. Created an empty project with flet create (and no dependencies other than flet) and tried to build that for windows.

The output is still pretty much identical to last time. Whatever issue it is with the build tools I think it might be out of my control for now. Like I said, though, PyInstaller worked as an alternative. So, I appreciate that recommendation.

One more thing I did was running flet build windows with the -vv option (double verbose?) and the output is way too long to put in this reply, so I pasted it into a file and attached it instead. Not sure if this helps but here it is:

output.txt