[InvalidOperationException: The control with ID 'ImageButton1_ModalPopupExtender' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it.]
System.Web.UI.ExtenderControl.get_ScriptManager() +416690
System.Web.UI.ExtenderControl.RegisterWithScriptManager() +126
AjaxControlToolkit.ExtenderControlBase.OnPreRender(EventArgs e) in d:\hg\act\Server\AjaxControlToolkit\ExtenderBase\ExtenderControlBase.cs:365
AjaxControlToolkit.ModalPopupExtender.OnPreRender(EventArgs e) in d:\hg\act\Server\AjaxControlToolkit\ModalPopup\ModalPopupExtender.cs:210
System.Web.UI.Control.PreRenderRecursiveInternal() +90
System.Web.UI.Control.PreRenderRecursiveInternal() +163
System.Web.UI.Control.PreRenderRecursiveInternal() +163
System.Web.UI.Control.PreRenderRecursiveInternal() +163
System.Web.UI.Control.PreRenderRecursiveInternal() +163
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +906
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