Cannot install package from nuget

[ristaloff]

I get this error, when trying to add the nuget package to my project:

Could not install package 'ServiceStack.Authentication.Aad 0.1.30'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.5', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.