>>Hi everybody,
>>
>>We upgraded the project to the latest MVC (and other packages to the latest) and now we are unable to run the application. The error comes from the
>>
>>routes.MapMvcAttributeRoutes(); method in the RouteConfig class and the error is
>>
>>Exception Details: System.ArgumentException: Cannot call action method 'System.Web.Mvc.PartialViewResult ErrorView[T](T, System.String, System.String, System.String)' on controller 'SysManager.Web.Areas.AccountingAudit.Controllers.PaymentTypesController' because the action method is a generic method.
>>Parameter name: methodInfo
>>
>>Source Error:
>>
>>
>>Line 14: routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
>>Line 15:
>>Line 16: routes.MapMvcAttributeRoutes();
>>Line 17:
>>Line 18: AreaRegistration.RegisterAllAreas();
>>
>>Source File: c:\_Siriusware\Main\SysManager\SysManager.Web\App_Start\RouteConfig.cs Line: 16
>>
>>Stack Trace:
>>

>>
>>[ArgumentException: Cannot call action method 'System.Web.Mvc.PartialViewResult ErrorView[T](T, System.String, System.String, System.String)' on controller 'SysManager.Web.Areas.AccountingAudit.Controllers.PaymentTypesController' because the action method is a generic method.
>>Parameter name: methodInfo]
>>   System.Web.Mvc.ReflectedActionDescriptor..ctor(MethodInfo methodInfo, String actionName, ControllerDescriptor controllerDescriptor, Boolean validateMethod) +336
>>   System.Web.Mvc.ReflectedActionDescriptor..ctor(MethodInfo methodInfo, String actionName, ControllerDescriptor controllerDescriptor) +45
>>   System.Web.Mvc.Async.<>c__DisplayClass4.<GetActionDescriptorDelegate>b__2(String actionName, ControllerDescriptor controllerDescriptor) +73
>>   System.Web.Mvc.Routing.AttributeRoutingMapper.GetActionDescriptors(ReflectedAsyncControllerDescriptor controller) +240
>>   System.Web.Mvc.Routing.AttributeRoutingMapper.AddRouteEntries(SubRouteCollection collector, IEnumerable`1 controllerTypes, IInlineConstraintResolver constraintResolver, IDirectRouteProvider directRouteProvider) +201
>>   System.Web.Mvc.Routing.AttributeRoutingMapper.MapAttributeRoutes(RouteCollection routes, IEnumerable`1 controllerTypes, IInlineConstraintResolver constraintResolver, IDirectRouteProvider directRouteProvider) +333
>>   System.Web.Mvc.Routing.AttributeRoutingMapper.MapAttributeRoutes(RouteCollection routes, IInlineConstraintResolver constraintResolver, IDirectRouteProvider directRouteProvider) +397
>>   System.Web.Mvc.Routing.AttributeRoutingMapper.MapAttributeRoutes(RouteCollection routes, IInlineConstraintResolver constraintResolver) +192
>>   System.Web.Mvc.RouteCollectionAttributeRoutingExtensions.MapMvcAttributeRoutes(RouteCollection routes) +123
>>   SysManager.Web.RouteConfig.RegisterRoutes(RouteCollection routes) in c:\_Siriusware\Main\SysManager\SysManager.Web\App_Start\RouteConfig.cs:16
>>   SysManager.Web.MvcApplication.Application_Start() in c:\_Siriusware\Main\SysManager\SysManager.Web\Global.asax.cs:26
>>

>>Do you know what should be fixed to make it work? Can you check what do you have in that class?
>>
>>Thanks in advance.
>
>Hmm. Don't think this is related to the latest packages - the behaviour seems to have been that way for a long time. See:
>http://stackoverflow.com/questions/2870116/cannot-call-action-method-system-web-mvc-partialviewresult-foott-on-contro
>
>Bottom line: your ErrorView can't be generic......

Everything worked before the update. Here is what we have in the BaseController:

/// <summary>
        /// Returns a partial view indicating that an error has occurred.
        /// </summary>
        /// <typeparam name="T">The type of view model to use for the view (type must derive from BaseEditViewModel).</typeparam>
        /// <param name="viewModel">The view model to use for the view.</param>
        /// <param name="viewName">The name of the view.</param>
        /// <param name="message">The error message to present in the view.</param>
        /// <param name="errorProperty">The name of a property for which an error should be added to the model state.  This parameter is optional
        /// and if it is not specified, no error will be added to the model state.</param>
        /// <returns>PartialViewResult</returns>
        public PartialViewResult ErrorView<T>(T viewModel, string viewName, string message, string errorProperty = "") where T : BaseEditViewModel
        {
            viewModel.ErrorMessage = message;

            if (!String.IsNullOrEmpty(errorProperty))
            {
                ModelState.AddModelError(errorProperty, message); 
            }

            return PartialView(viewName, viewModel);
        }

What do you have there?