WinUI repo “microsoft-ui-xaml-lift” report a large number of errors after building

[XamlTest]

Describe the bug

Failed to build WinUI repo(https://microsoft.visualstudio.com/DefaultCollection/WinUI/_git/microsoft-ui-xaml-lift) with a large number of errors. The repo can be built successfully before, not sure what's causing these errors (Xaml code, Visual Studio or Virtual Machine).

Such as below screenshots:

Steps to reproduce the bug

Repro Steps:

1. Clone WinUI repo from https://microsoft.visualstudio.com/DefaultCollection/WinUI/_git/microsoft-ui-xaml-lift
2. Open Visual Studio go to Tools->Command Line ->Developer Command Prompt to open a Developer CMD prompt.
3. In the root of repo, run init.cmd
4. After Initialize successfully.
5. Run build.cmd.

Actual Result:
ERROR: Build solution for c:\repo\dxaml\Microsoft.UI.Xaml.sln FAILED.
Binlog:
Microsoft.UI.Xaml.amd64chk.zip

Expected behavior

Build Successfully.

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.5.3: 1.5.240428000

Windows version

No response

Additional context

Windows Version: 23H2(22631.3593).
VS Version: 17.11.0 Preview 2.0 [34928.264.main]

[github-actions]

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[kmgallahan]

AFAIK it is not possible to build from the source. Only MS can create WinUI / WASDK builds.

[codendone]

@kmgallahan is correct. See #8980:

Q: ​Will we be able to build from the source or only view due to private dependencies?

A: To be clear, we are doing shared source, not open source, as there are underlying interwoven components linking WinUI 3 to the system that we can't share. We will not support building, deploying, or running the source code and will not accept PRs for it. We will support viewing, searching, and debugging of the source code when it is available.

That info is also in README.md in the winui3 branch:

Please note that although the source code for WinUI 3 is available in this repository it cannot be compiled by non-Microsoft developers at this time.

[codendone]

I updated my comment above to point to another reference, which can be a little hidden due to being in the winui3/ branches.