https://www.dotnetzone.gr:443/cs/blogs/birbilis/archive/2019/10/18/fix-a-numeric-comparison-was-attempted-at-vs-build-costura-fody.aspxAfter upgrading from Visual Studio 2017 to Visual Studio 2019 I was able to update NuGet packages Fody and Costura.Fody of a solution that needed them (to package assembly DLLs inside console EXEcutables) and the solution was rebuilding fine. HoweverelCommunityServer 2.1 SP3 (Build: 20423.1)