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Error NETSDK1005: Assets file 'project.assets.json' doesn't have a target for 'netcoreapp3.1'

Short post today as a reminder for myself if I ever get this error again...

When trying to build and deploy an older .NET Core 3.1 app, the build server returned the following error message:

:\Program Files\dotnet\sdk\5.0.100\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(241,5): Error NETSDK1005: Assets file 'D:\b\4\agent\_work\2\s\Loket\obj\project.assets.json' doesn't have a target for 'netcoreapp3.1'. Ensure that restore has run and that you have included 'netcoreapp3.1' in the TargetFrameworks for your project.

Process 'msbuild.exe' exited with code '1'.

We discovered that the issue was caused by a change in the .NET SDK starting from .NET 5.0. The project.assets.json mentioned in the error message above is created by NuGet in the obj\ folder. The .NET SDK uses it to get information about packages to pass into the compiler.

In .NET 5, Nuget added a new field called TargetFrameworkAlias, and thus in MSBuild versions < 16.8 or NuGet versions < 5.8, it is possible that you can generate an assets file without the TargetFrameworkAlias as it will read the property and not find it explaining the error message above.

To fix it, we updated our build pipeline specifying that at least MSBuild version 16.8 and NuGet version 5.8 are used.



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