[InvalidOperationException: Sequence contains no matching element]
System.Linq.Enumerable.First(IEnumerable`1 source, Func`2 predicate) +281
Web.Categories.Page_Load(Object sender, EventArgs e) +307
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
System.Web.UI.Control.OnLoad(EventArgs e) +97
System.Web.UI.<LoadRecursiveAsync>d__246.MoveNext() +229
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
System.Web.Util.WithinCancellableCallbackTaskAwaiter.GetResult() +32
System.Web.UI.<ProcessRequestMainAsync>d__523.MoveNext() +4853
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