[InvalidOperationException: Only one instance of a ScriptManager can be added to the page.]
System.Web.UI.ScriptManager.OnInit(EventArgs e) +584683
System.Web.UI.Control.InitRecursive(Control namingContainer) +173
System.Web.UI.Control.InitRecursive(Control namingContainer) +380
System.Web.UI.Control.InitRecursive(Control namingContainer) +380
System.Web.UI.Control.InitRecursive(Control namingContainer) +380
System.Web.UI.Control.InitRecursive(Control namingContainer) +380
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +491
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