Код ошибки : 200

Причина ошибки : The parameters dictionary contains a null entry for parameter 'HotelId' of non-nullable type 'System.Guid' for method 'System.Web.Mvc.JavaScriptResult WidgetRoomJS(System.Guid, System.Guid, System.Guid, System.String, System.String, System.String, System.String, System.String, System.String, System.String, System.String, System.String, System.String, Boolean, System.String, System.String, System.String)' in 'Asisia_Portal.Controllers.HotelController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter. Parameter name: parameters