[InvalidOperationException: Sequence contains no elements]
System.Linq.Enumerable.Single(IEnumerable`1 source) +317
Geos.MercatinoUsato.MilanoTandem.Vetrina.Categoria.Page_Load(Object sender, EventArgs e) in C:\Dati\Progetti\Geos\Geos.MercatinoUsato-LIVE\WebsiteCustom\MilanoTandem\Geos.MercatinoUsato.MilanoTandem\Vetrina\Categoria.aspx.cs:48
System.Web.UI.Control.OnLoad(EventArgs e) +108
System.Web.UI.Control.LoadRecursive() +11725592
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533
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