Only one instance of a ScriptManager can be added to the page.
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Technical Details:
Application Exception:
Application Source: System.Web.Extensions
Application Stacktrace: at System.Web.UI.ScriptManager.OnInit(EventArgs e) at AjaxControlToolkit.ToolkitScriptManager.OnInit(EventArgs e) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.AddedControl(Control control, Int32 index) at System.Web.UI.ControlCollection.Add(Control child) at BayshoreSolutions.WebModules.WebpageBase.RenderModules() at BayshoreSolutions.WebModules.WebpageBase.OnInit(EventArgs e) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)