[InvalidOperationException: Sequence contains no elements]
System.Linq.Enumerable.Single(IEnumerable`1 source) +317
Rehfeld.VisualDrg.Business.DiagramBC.FindDiagramByIdAndYear(Int32 diagramID, Int32 year) +462
Rehfeld.VisualDrg.UI.ShowDiagram.get_Diagram() +214
Rehfeld.VisualDrg.UI.ShowDiagram.InitDiagram() +17
Rehfeld.VisualDrg.UI.ShowDiagram.OnPreRender(EventArgs e) +24
System.Web.UI.Control.PreRenderRecursiveInternal() +132
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3671
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