http://developers.de/blogs/damir_dobric/archive/2012/04/10/asp-net-webapi-failed-to-load-system-net-http-exception.aspxWe have an old project (WebApplication NET3.5) which hosts few SOAP WebServices and wanted to extend it to provide some REST services for mobile devices. To do that we installed the ASP WebApi by using the NuGet package provided here: http://www.nugetenCommunityServer 2008 SP1 (Build: 30619.63)