Unable to add package in my web api project.

[DevHamza-Core]

[EdWin1409]

I think this is because the package is .net Standard 2.0. Framework 4.5.2 is not compatible with .net Standard 2.0. You have to use at least .net Framework 4.6.1 (or better 4.7.2) in your project, see https://docs.microsoft.com/en-us/dotnet/standard/net-standard.