Error while creating a WinUI 3, C# on Desktop project.

Describe the bug Creating a new WinUI 3,0 project using the C# on Desktop (package) project results in an error:

A problem was encountered creating the sub project 'Arctium Sandbox Studio'. The expression "[Microsoft.Build.Utilities.ToolLocationHelper]::GetPlatformSDKLocation('', 10.0.18362.0)" cannot be evaluated. Parameter "targetPlatformIdentifier" cannot have zero length. C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Current\Bin\Microsoft.Common.CurrentVersion.targets

Steps to reproduce the bug

1. Install the latest VS 2019 Preview+ .NET 5 (Preview 8/RC1)
2. Install the WinUI 3.0 Preview2 extension.
3. Create a WinUI C# on Desktop project.

Expected behavior It should create the project without any errors instead of failing.

Version Info WinUI 3 Preview 2

Windows 10 Pro Insider Preview Build 20170

Desktop

Additional context

[stevenbrix]

Here is the install script I use Install-DotNet.zip

If you run this in an admin powershell window: Install-DotNet -version 5.0.100-preview.5.20279.10. This will install both x86 and x64 to program files.

Then you can add a global.json that looks like this:

{
  "sdk": {
    "version": "5.0.100-preview.5.20279.10"
  }
}

[marcinsmialek]

With .NET 5 just around the corner, when do you think this will be fixed?