[ArgumentNullException: Value cannot be null.
Parameter name: source]
System.Linq.Enumerable.First(IEnumerable`1 source) +377
Previlemos.seguro_equipamento.Page_Load(Object sender, EventArgs e) in D:\Users\ferna\Source\Repos\Seguro\Previlemos\seguro_equipamento.aspx.cs:25
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +154
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4082
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