[InvalidOperationException: Sequence contains no elements]
System.Linq.Enumerable.Single(IEnumerable`1 source) +317
SysexDBV2.Biz.DeviceBiz.GetByFriendlyUrl(AND_SyxLibEdEntities ctx, String idFriendlyUrl) in C:\Users\andrea\source\repos\SysexDBRoot\SysexDBV2.Biz\DeviceBiz.cs:86
SysexDBV2.Biz.FriendlyUrlBiz.CreateByDevice(Device o) in C:\Users\andrea\source\repos\SysexDBRoot\SysexDBV2.Biz\FriendlyUrlBiz.cs:170
SysexDBV2.Biz.FriendlyUrlBiz.GetOrCreateByDevice(Device a) in C:\Users\andrea\source\repos\SysexDBRoot\SysexDBV2.Biz\FriendlyUrlBiz.cs:138
SysexDBV2.Web.UI.synth_detail.LoadData() in C:\Users\andrea\source\repos\SysexDBRoot\SysexDBV2.Web.UI\synth_detail.aspx.cs:72
SysexDBV2.Web.UI.synth_detail.Page_Load(Object sender, EventArgs e) in C:\Users\andrea\source\repos\SysexDBRoot\SysexDBV2.Web.UI\synth_detail.aspx.cs:57
System.Web.UI.Control.OnLoad(EventArgs e) +108
SysexDBV2.Web.UI.BasePage.OnLoad(EventArgs e) in C:\Users\andrea\source\repos\SysexDBRoot\SysexDBV2.Web.UI\Tools\BasePage.cs:23
System.Web.UI.Control.LoadRecursive() +90
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533
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