[NullReferenceException: Object reference not set to an instance of an object.]
System.Data.Objects.ELinq.QueryParameterExpression.EvaluateParameter(Object[] arguments) +423
System.Data.Objects.ELinq.ELinqQueryState.GetExecutionPlan(Nullable`1 forMergeOption) +1514
System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) +152
System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator() +40
System.Linq.Enumerable.Single(IEnumerable`1 source) +142
PagedList.PagedList`1..ctor(IQueryable`1 superset, Int32 pageNumber, Int32 pageSize) +93
WebUnicity.Controllers.KhoaToController.GetArticle(Nullable`1 page, ArticleCategory cat) in H:\A_WORK\CDSP_GiaLai\cdspgialai\cdspgialaiv1.1\Controllers\KhoaToController.cs:56
WebUnicity.Controllers.KhoaToController.Category(Int32 id, Nullable`1 page) in H:\A_WORK\CDSP_GiaLai\cdspgialai\cdspgialaiv1.1\Controllers\KhoaToController.cs:38
lambda_method(Closure , ControllerBase , Object[] ) +205
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +253
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +35
System.Web.Mvc.Async.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41() +34
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +57
System.Web.Mvc.Async.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33() +77
System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +372
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +57
System.Web.Mvc.Async.<>c__DisplayClass2a.<BeginInvokeAction>b__20() +32
System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) +187
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +50
System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +24
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +25
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +64
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +25
System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +50
System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +38
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +25
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +50
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +602
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +195
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +128
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