[InvalidOperationException: Sequence contains no elements]
System.Linq.Enumerable.Single(IEnumerable`1 source) +320
lambda_method(Closure ) +211
System.Linq.EnumerableExecutor`1.Execute() +106
System.Linq.EnumerableExecutor`1.ExecuteBoxed() +10
System.Linq.EnumerableQuery`1.System.Linq.IQueryProvider.Execute(Expression expression) +98
Composite.Data.Foundation.DataFacadeQueryable`1.Execute(Expression expression) +94
System.Linq.Queryable.Single(IQueryable`1 source) +220
C1Function.Page_Load(Object sender, EventArgs e) +477
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
System.Web.UI.Control.OnLoad(EventArgs e) +97
System.Web.UI.Control.LoadRecursive() +61
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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