ASP.Net Web API showing correctly in VS but giving HTTP500

Question

after a lot of help yesterday, I came up against a known error in asp.net4 beta - I upgraded to VS2012 RC Express (4.5), and now I\'m getting an internal server error, and I

Answer 1

are you doing:

db.tblCustomerBookings.Include("tblRentals").Select(i => 
    new { i.something //etc });

also, which MediaTypeFormatter are you using, Xml or Json? Error 500 often means that Formatter is choking.

Switch to JSON.NET formatter (in Web API RC the easiest way is to do GlobalConfiguration.Configuration.Formatters.RemoveAt(1) - this removes XML formatter) and see if it helps or at least gives more meaningful error (or request your method with content type JSON).