How to resolve [UNOB0001] Cannot build with both Uno.WinUI and Uno.UI nuget packages referenced. https://aka.platform.uno/UNOB0001

[Lerseb]

What do you need help with?

Uno.UI and Uno.WinUI are pretty confusing.
I have read already the documentation on : https://platform.uno/docs/articles/uno-build-error-codes.html
It is difficult because WinUI comes in some library names even the ones starting with Uno.UI...
Is there a simple list of libraries to use to start with the basics (doesn't have to be fancy) and preventing from getting the error from the topic?
I guess the problem is not knowing much about Uno, I am using the examples which use a bit of both.
Thanks in advance for any help.

[Youssef1313]

Basically, from Microsoft tech there is UWP (uses Windows.UI.Xaml for most namespaces) and WinUI (uses Microsoft.UI.Xaml for most namespace).

Uno provides both API sets. The UWP API set is present in Uno.UI NuGet package, and the WinUI API set is present in Uno.WinUI NuGet package.

With regards to the error you're having, either a repro project or a binary log will be helpful for determining the root cause. To get a binary log, you can build from the command line with dotnet build -bl which will produce a file called msbuild.binlog

[Lerseb]

Github doesn't allow me to share the msbuild.binlog. I cannot attach the file.
I double checked all my projects and removed all the Uno.WinUI packages even in Directory.Packages.Props but I still get the same problem when debugging with Rider.
When I am running the dotnet build -bl command, I get the verbose below (don't know if it helps) :

(base) sebastienleroux@Sebastiens-MacBook-Pro-14 ObserVisionUno % dotnet build -bl
MSBuild version 17.8.3+195e7f5a3 for .NET
  Determining projects to restore...
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Skia.Gtk/ObserVisionUno.Skia.Gtk.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.Core 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.Core 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0-windows10.0.19041'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Skia.Gtk/ObserVisionUno.Skia.Gtk.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.EntityFramework 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.EntityFramework 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0-windows10.0.19041'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno/ObserVisionUno.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.Core 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno/ObserVisionUno.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.EntityFramework 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
  Restored /Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Skia.Gtk/ObserVisionUno.Skia.Gtk.csproj (in 874 ms).
  Restored /Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Wasm/ObserVisionUno.Wasm.csproj (in 907 ms).
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605: Warning As Error: Detected package downgrade: Microsoft.WindowsAppSDK from 1.4.231219000 to 1.4.231008000. Reference the package directly from the project to select a different version.  [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605:  ObserVisionUno.Windows -> Uno.Extensions.Reactive.WinUI 4.0.0 -> Microsoft.WindowsAppSDK (>= 1.4.231219000)  [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605:  ObserVisionUno.Windows -> Microsoft.WindowsAppSDK (>= 1.4.231008000) [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605: Warning As Error: Detected package downgrade: Microsoft.WindowsAppSDK from 1.4.231219000 to 1.4.231008000. Reference the package directly from the project to select a different version.  [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605:  ObserVisionUno.Windows -> Uno.Extensions.Reactive.WinUI.Markup 4.0.0 -> Microsoft.WindowsAppSDK (>= 1.4.231219000)  [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605:  ObserVisionUno.Windows -> Microsoft.WindowsAppSDK (>= 1.4.231008000) [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605: Warning As Error: Detected package downgrade: Microsoft.WindowsAppSDK from 1.4.231219000 to 1.4.231008000. Reference the package directly from the project to select a different version.  [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605:  ObserVisionUno.Windows -> ObserVisionUno -> Uno.Extensions.Hosting.WinUI 4.0.0 -> Microsoft.WindowsAppSDK (>= 1.4.231219000)  [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605:  ObserVisionUno.Windows -> Microsoft.WindowsAppSDK (>= 1.4.231008000) [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
  Failed to restore /Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj (in 1.07 sec).
  Restored /Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno/ObserVisionUno.csproj (in 1.12 sec).
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Mobile/ObserVisionUno.Mobile.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.Core 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0-android34.0'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Mobile/ObserVisionUno.Mobile.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.EntityFramework 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0-android34.0'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
  Restored /Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Mobile/ObserVisionUno.Mobile.csproj (in 2.2 sec).
  10 of 15 projects are up-to-date for restore.

Build FAILED.

/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Skia.Gtk/ObserVisionUno.Skia.Gtk.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.Core 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.Core 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0-windows10.0.19041'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Skia.Gtk/ObserVisionUno.Skia.Gtk.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.EntityFramework 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.EntityFramework 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0-windows10.0.19041'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno/ObserVisionUno.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.Core 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno/ObserVisionUno.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.EntityFramework 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Mobile/ObserVisionUno.Mobile.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.Core 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0-android34.0'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Mobile/ObserVisionUno.Mobile.csproj : warning NU1701: Package 'Microsoft.AspNet.Identity.EntityFramework 2.2.4' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0-android34.0'. This package may not be fully compatible with your project. [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605: Warning As Error: Detected package downgrade: Microsoft.WindowsAppSDK from 1.4.231219000 to 1.4.231008000. Reference the package directly from the project to select a different version.  [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605:  ObserVisionUno.Windows -> Uno.Extensions.Reactive.WinUI 4.0.0 -> Microsoft.WindowsAppSDK (>= 1.4.231219000)  [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605:  ObserVisionUno.Windows -> Microsoft.WindowsAppSDK (>= 1.4.231008000) [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605: Warning As Error: Detected package downgrade: Microsoft.WindowsAppSDK from 1.4.231219000 to 1.4.231008000. Reference the package directly from the project to select a different version.  [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605:  ObserVisionUno.Windows -> Uno.Extensions.Reactive.WinUI.Markup 4.0.0 -> Microsoft.WindowsAppSDK (>= 1.4.231219000)  [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605:  ObserVisionUno.Windows -> Microsoft.WindowsAppSDK (>= 1.4.231008000) [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605: Warning As Error: Detected package downgrade: Microsoft.WindowsAppSDK from 1.4.231219000 to 1.4.231008000. Reference the package directly from the project to select a different version.  [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605:  ObserVisionUno.Windows -> ObserVisionUno -> Uno.Extensions.Hosting.WinUI 4.0.0 -> Microsoft.WindowsAppSDK (>= 1.4.231219000)  [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.Windows/ObserVisionUno.Windows.csproj : error NU1605:  ObserVisionUno.Windows -> Microsoft.WindowsAppSDK (>= 1.4.231008000) [/Users/sebastienleroux/RiderProjects/Prod_IpsumVision30/ObserVisionUno/ObserVisionUno.sln]
    8 Warning(s)
    3 Error(s)

Time Elapsed 00:00:03.16

[Youssef1313]

Thanks @Lerseb
You can zip the binlog