Maybe Relevant information: I have a web application I built with .net 4.5. I wanted to deploy to Azure\'s Web Sites but it only supports .net 4.0 so I downgraded the projec
I solved a similar problem (System.Web.Http and System.Net.Http.Formatting) error by removing the reference to problem reference (which was pointed to my .Net installation folder) and replacing it with the reference file in my packages folder that was installed by the Microsoft.AspNet.WebApi NuGet package.