[InvalidOperationException: Only one instance of a ScriptManager can be added to the page.]
System.Web.UI.ScriptManager.OnInit(EventArgs e) +452120
AjaxControlToolkit.ToolkitScriptManager.OnInit(EventArgs e) in f:\TeamCity\buildAgent\work\80acd78aa4c25314\Server\AjaxControlToolkit\ToolkitScriptManager\ToolkitScriptManager.cs:305
System.Web.UI.Control.InitRecursive(Control namingContainer) +139
System.Web.UI.Control.InitRecursive(Control namingContainer) +312
System.Web.UI.Control.InitRecursive(Control namingContainer) +312
System.Web.UI.Control.InitRecursive(Control namingContainer) +312
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +408
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