'RSClientController' is undefined

Try this ,

 <system.webServer>
<handlers>
<add name="Reserved.ReportViewerWebControl.axd" path="Reserved.ReportViewerWebControl.axd" verb="*" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" resourceType="Unspecified" preCondition="integratedMode" />
</handlers>
</system.webServer>

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