Winui 3, Blank App does not build/ also Latest Github Microsoft-ui-xaml examples does not build

[professordave]

Describe the bug

Create a new blank WinUI app.
Try to build it.

Severity Code Description Project File Line Suppression State
Error The source file for this compilation can be found at: "C:\Users\dkafriss\AppData\Local\Temp\ccf1e6d3-87f9-4612-9126-bacaf99895d4.txt" App59 C:\Users\dkafriss.nuget\packages\microsoft.projectreunion.winui\0.8.1\buildTransitive\Microsoft.UI.Xaml.Markup.Compiler.interop.targets 257

Severity Code Description Project File Line Suppression State
Error MSB3758 An error has occurred during compilation. error CVT1101: cannot open 'c:\Users\dkafriss\AppData\Local\Temp\tuf5pycu\CSC537CD49A921A4E6588C0AA408B3584C8.TMP' for reading App59 C:\Users\dkafriss.nuget\packages\microsoft.projectreunion.winui\0.8.1\buildTransitive\Microsoft.UI.Xaml.Markup.Compiler.interop.targets 257

Severity Code Description Project File Line Suppression State
Error MSB4175 The task factory "CodeTaskFactory" could not be loaded from the assembly "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Current\Bin\Microsoft.Build.Tasks.Core.dll". The task factory must return a value for the "TaskType" property. App59 C:\Users\dkafriss.nuget\packages\microsoft.projectreunion.winui\0.8.1\buildTransitive\Microsoft.UI.Xaml.Markup.Compiler.interop.targets 257

Severity Code Description Project File Line Suppression State
Warning NU1701 Package 'Microsoft.ProjectReunion.InteractiveExperiences 0.8.1' was restored using 'net5.0-windows10.0.19041, .NETCoreApp,Version=v3.1, .NETCoreApp,Version=v3.0, .NETCoreApp,Version=v2.0, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, net5.0-windows10.0.18362, net6.0-windows10.0.18362, .NETFramework,Version=v4.6.1' instead of the project target framework 'UAP,Version=v10.0.18362'. This package may not be fully compatible with your project. App59 (Package) C:\Users\dkafriss\source\repos\App59\App59\App59 (Package)\App59 (Package).wapproj 1

Steps to reproduce the bug

Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'

Expected behavior

Screenshots

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Version Info

NuGet package version:

Windows app type:

UWP	Win32

Windows 10 Enterprise
19043.1110
21H1
Windows Feature Experience Pack 120.2212.3530.0

Visual Studio 2019 16.10.4

Also tried with
Visual Studio 2019 Preview
16.11.0 Preview 3.0

When using Preview the project type is .net Maui

Downloaded the Xaml controls Gallery
from
https://github.com/microsoft/Xaml-Controls-Gallery/tree/winui3

Windows version	Saw the problem?
Insider Build (xxxxx)
October 2020 Update (19042)
May 2020 Update (19041)
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop
Xbox
Surface Hub
IoT

Additional context

[StephenLPeters]

@evelynwu-msft any idea whats going on here?

[evelynwu-msft]

This appears to be an issue with the local environment, not WinUI-related. For future reference, Visual Studio's Report a problem feature should be used if this sort of error occurs again.