[ArgumentOutOfRangeException: 'lstUoAs' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value]
System.Web.UI.WebControls.ListControl.PerformDataBinding(IEnumerable dataSource) +2751496
MyASPControls.GroupedDropdownList.PerformDataBinding(IEnumerable dataSource) +36
System.Web.UI.WebControls.ListControl.OnDataBinding(EventArgs e) +303
System.Web.UI.WebControls.ListControl.PerformSelect() +38
System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +76
WebRole1.Results.LoadUoAs() +2107
WebRole1.Results.LoadFilters() +33
WebRole1.Results.FilterResults(Int16 page) +1197
WebRole1.Results.Page_Load(Object sender, EventArgs e) +2788
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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