Fody is only supported on MSBuild 16 and above. Current version: 15

Question

Visual Studio 2017 let me know there was an upgrade to Fody version 5 this morning. I accepted and did a NuGet package update of both Fody and PropertyChanged.Fody.

Now

Answer 1

Please downgrade Fody to version 4.2.1.

Answer 2

Upgrade to Visual Studio 2019 https://visualstudio.microsoft.com/downloads/

Answer 3

For what it's worth - I ran into the same situation. A colleague added Fody with no other reason than to reduce the number of files created upon building.

Rather than deal with downgrading plugin versions or upgrading VS2017 to VS2019, I removed Fody from the project (as it had no real added value in the project).