[ArgumentNullException: Value cannot be null.
Parameter name: source]
System.Linq.Enumerable.ToList(IEnumerable`1 source) +136
HtmlClient.Pages.FrmLoginInicial.Page_PreInit(Object sender, EventArgs e) in C:\Trabajo\RetailWeb\Azure\CO-RETAIL-BIOMETRICO\HtmlClient\Pages\FrmLoginInicial.aspx.cs:167
System.Web.UI.Page.OnPreInit(EventArgs e) +141
System.Web.UI.Page.PerformPreInit() +46
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1178
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