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Compiler error ASPIRE007 after upgrading Aspire

After upgrading the .NET Aspire NuGet packages to the latest version on one of my projects, I started to get the following compiler error:

'Project' requires a reference to "Aspire.AppHost.Sdk" with version "9.0.0" or greater to work correctly. Please add the following line after the Project declaration <Sdk Name="Aspire.AppHost.Sdk" Version="9.0.0" />.

The error message is self explanatory and clearly defines how we could fix this. Add the Sdk reference to your csproj file to get rid of this compiler error:

The strange thing was that after applying the upgrade on one branch, I also started to get the same compiler error on other branches although the Aspire NuGet were not (yet) upgraded on these branches.

Bizar!

More information

Compiler Error ASPIRE007 - .NET Aspire | Microsoft Learn

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