The year is 2016. In the bustling corridors of Redmond, a quiet hero was about to be born: Microsoft .NET Framework v4.6.2
System.ValueTuple than what 4.6.2 provides.System.ValueTuple NuGet package into your project, or upgrade to .NET Framework 4.7+ where this is native.: You can verify if it is installed by checking the registry under microsoft .net framework v4.6.2