VS2019 Error: Invalid option '9' for /langversion

Hi I am looking at migrating my tinyclr project from VS2017 to VS2019. Installed the 2.1.0 vsix file, and the 2.1 version nuget TinyCLR Core. The core nuget is showing as installed. Starting with a new project, I just added in a hello world debug.writelin in main. The build fails with “Invalid Option ‘9’ for /langverision. Use ‘/langversion:?’ to list supported values.”

Any idea of the fix?


Never mind, I reinstalled VS2019 and all is fine, something wrong with the installer…

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