You may receive the error when using the Ajax toolkit and ReportViewer on the page, e.g.
This is because the Ajax control is conflict with the ReportViewer, it will works if you using the .Net ScriptManager. But because you need the ToolkitScriptManager for your Ajax controld, therefore this is not an option.
But that is work around/fix for this error, which is just simply change your ToolkitScriptManager to ScriptMode="Release" and it will work like charm.
Not working
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