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[ArgumentException: The parameters dictionary contains a null entry for parameter cat_id of non-nullable type System.Int32 for method System.Web.Mvc.ActionResult Show(Int32, Int32, Int32, Int32, Int32) in Fansio.Controllers.PeopleController. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter. 參數名稱: parameters] System.Web.Mvc.ActionDescriptor.ExtractParameterFromDictionary(ParameterInfo parameterInfo, IDictionary`2 parameters, MethodInfo methodInfo) +445 System.Web.Mvc.<>c__DisplayClass1.<Execute>b__0(ParameterInfo parameterInfo) +19 System.Linq.WhereSelectArrayIterator`2.MoveNext() +78 System.Linq.Buffer`1..ctor(IEnumerable`1 source) +434 System.Linq.Enumerable.ToArray(IEnumerable`1 source) +81 System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +132 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(Controll...