Web API error: The 'ObjectContent`1' type failed to serialize the response body for content type 'application/xml; charset=utf-8'.

Hello All
If you are getting below in api

Web API error: The 'ObjectContent`1' type failed to serialize the response body for content type.

Autofac - Make sure that the controller has a parameterless public constructor

Hi All

Autofac - Make sure that the controller has a parameterless public constructor this is error.

Open you ServiceModule File 

Register the Interface and service name those are mentioned in controller.

Example are as below:-

 builder.RegisterType<MenuService>().As<IMenuService>();

Attempt by security transparent method 'WebMatrix.WebData.PreApplicationStartCode.Start()'

Hi friend today when you Update: same for mvc 4 to mvc 5. than this error is come 
Today i am also face same error so think post the same .