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Commented Issue: Microsoft JScript runtime error: Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method. [27133]

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Microsoft JScript runtime error: Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method.

I get this iritating warning on my webpage when i use TabContainer (uisng Ajax tab).
When i run it i can simply tell to ignore and the code works and doing what its intending to do, but i cant have people to check the warning box so they can use the application.

Cant find a solution for it.
running VS 2010
AjaxControlToolkit 4.1.5.1116.0

Pleas. If any have a good solution and code to fix it.


<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="cc1" %>
*
*
*
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true"></asp:ScriptManager>
<cc1:TabContainer ID="tbMain" runat="server"
Height="100%" Width="840"
ActiveTabIndex="0" BorderStyle="NotSet" BorderWidth="0"
CssClass="ajax__CustomTabStyle">
<cc1:TabPanel ID="tabPanel1" runat="server" HeaderText="Lista" Width="100%"
Enabled="true" ScrollBars="Auto" OnDemandMode="Once" CssClass="ajax__CustomTabStyle">
<ContentTemplate>
**** plain textbox, labels and nothing fancy
</ContentTemplate>
</cc1:TabPanel
</cc1:TabContainer



Comments: We are using VS 2013 and have a web application built with .Net 4.5.1 and downloaded the latest AjaxControlToolkit package v8 and get the same exceptions. How do we get past these exceptions? Is there some kind of web.config setting we need to make? > "This is the ASP.NET error event we have received: Event code: 3012 Event message: An error occurred processing a web or script resource request. The requested resource 'pOurApp.BusinessLayer|AjaxControlToolkit.Styles.Tabs.min.css' does not exist or there was a problem loading it. " In the event log for the web server, we get: Thank you!

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