Server Error in '/' Application.

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[MethodAccessException: Attempt by method 'System.Web.Http.HttpConfiguration..ctor(System.Web.Http.HttpRouteCollection)' to access method 'System.Web.Http.HttpConfiguration.DefaultFormatters()' failed.]
   System.Web.Http.HttpConfiguration..ctor(HttpRouteCollection routes) +93
   System.Web.Http.GlobalConfiguration.<.cctor>b__0() +95
   System.Lazy`1.CreateValue() +416
   System.Lazy`1.LazyInitValue() +152
   System.Lazy`1.get_Value() +75
   System.Web.Http.GlobalConfiguration.get_Configuration() +35
   Umbraco.Web.WebBootManager.InitializeResolvers() +727
   Umbraco.Core.CoreBootManager.Initialize() +449
   Umbraco.Web.WebBootManager.Initialize() +128
   Umbraco.Core.UmbracoApplicationBase.StartApplication(Object sender, EventArgs e) +152
   Umbraco.Core.UmbracoApplicationBase.Application_Start(Object sender, EventArgs e) +40

[HttpException (0x80004005): Attempt by method 'System.Web.Http.HttpConfiguration..ctor(System.Web.Http.HttpRouteCollection)' to access method 'System.Web.Http.HttpConfiguration.DefaultFormatters()' failed.]
   System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) +9917985
   System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +118
   System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +172
   System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +336
   System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +296

[HttpException (0x80004005): Attempt by method 'System.Web.Http.HttpConfiguration..ctor(System.Web.Http.HttpRouteCollection)' to access method 'System.Web.Http.HttpConfiguration.DefaultFormatters()' failed.]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +9931880
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +101
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +254

i am using Autofac for IOC/DI here is the Initilizer

  builder.Register(c => UmbracoContext.Current).AsSelf();
            builder.RegisterControllers(Assembly.GetExecutingAssembly());
            builder.RegisterApiControllers(typeof(UmbracoApplication).Assembly);

            // Register application specific types

            //

            var container = builder.Build();
            var resolver = new AutofacWebApiDependencyResolver(container);
            GlobalConfiguration.Configuration.DependencyResolver = resolver;
            DependencyResolver.SetResolver(new AutofacDependencyResolver(container));

Any help will be appriciated

Thanks

Yogesh