The SDK 'Microsoft.DotNet.Arcade.Sdk' specified could not be found.

[ngruson]

I pulled down the Aspire repo but I can't build it in VS2022:
The SDK 'Microsoft.DotNet.Arcade.Sdk' specified could not be found.
I'm not able to load any project in the solution.
The Arcade SDK is used in Directory.Build.props.

How can I solve this?

[davidfowl]

Did you run build.cmd or build.sh?

[ngruson]

I did just now.

C:\dev\dotnet\aspire\artifacts\toolset\restore.proj : error :
  Could not resolve SDK "Microsoft.DotNet.Arcade.Sdk". Exactly one of the probing messages below indicates why we could
  not resolve the SDK. Investigate and resolve that message to correctly specify the SDK.
    SDK resolver "Microsoft.DotNet.MSBuildWorkloadSdkResolver" returned null.
    Unable to resolve 'Microsoft.DotNet.Arcade.Sdk (= 9.0.0-beta.24572.2)' for '.NETStandard,Version=v0.0'. PackageSourc
  eMapping is enabled, the following source(s) were not considered: dotnet-eng, dotnet-libraries, dotnet-public, dotnet9
  , dotnet9-transport.
  restore failed with 1 error(s) (0,0s)
    C:\dev\dotnet\aspire\artifacts\toolset\restore.proj : error MSB4236: The SDK 'Microsoft.DotNet.Arcade.Sdk' specified could not be found.

[ngruson]

I had to add a package source mapping for Microsoft.DotNet.Arcade.Sdk.
The projects that I was trying to look into are loading now.

Thanks for the swift response :).