An error occurred while processing your request - The parameters dictionary contains a null entry for parameter 'LetterId' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult DownloadDmd(Int32, System.String, Boolean)' in 'Aquilent.Cara.WebApp.Controllers.PublicController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter. Parameter name: parameters

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Inner Exception: 
Controller: Public
Action: DownloadCommentFile

Stack Trace:  at System.Web.Mvc.ActionDescriptor.ExtractParameterFromDictionary(ParameterInfo parameterInfo, IDictionary`2 parameters, MethodInfo methodInfo) at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext() at System.Linq.Buffer`1..ctor(IEnumerable`1 source) at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source) at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClassd.b__a() at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)