[InvalidOperationException: Sequence contains no elements]
System.Linq.Enumerable.Single(IEnumerable`1 source) +504
Rehfeld.VisualDrg.Business.UserSettings.TrySetVersion() +782
Rehfeld.VisualDrg.Business.UserSettings.set_CaseMixSystemType(CaseMixSystemType value) +17
System.EventHandler.Invoke(Object sender, EventArgs e) +0
System.Web.UI.Control.OnLoad(EventArgs e) +108
System.Web.UI.Control.LoadRecursive() +90
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533
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