can not seem to be able to fix this error

[modz2014]

System.IO.FileNotFoundException: Could not load file or assembly 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.
File name: 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
at MSBuild.Abstractions.MSBuildConversionWorkspaceLoader.LoadWorkspace(String path, Boolean noBackup, String tfm, Boolean keepCurrentTFMs, Boolean forceWeb)
at MSBuild.Conversion.Program.Run(String project, String workspace, String msbuildPath, String tfm, Boolean forceWebConversion, Boolean preview, Boolean diffOnly, Boolean noBackup, Boolean keepCurrentTfms, Boolean update, Boolean mauiConversion) in /_/src/try-convert/Program.cs:line 133

[MattBussing]

duplicate of #439

[modz2014]

I already did I didn't use nuget package

[MattBussing]

What version of VS and the dotnet sdk are you using?

[modz2014]

The latest one