SSRS report viewer Execution ' ' cannot be found (rsExecutionNotFound)Reserved.ReportViewerWebContro

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Re: SSRS report viewer Execution ' ' cannot be found
(rsExecutionNotFound) Reserved.ReportViewerWebControl.axd

Every now and then, my users get this error while in the Reportviewer.

Usually, they have to close the window where the report was rendered
and pull it open again. Attempting to open the report again does not
work.

What is this?

I run the report viewer like this:

<rsweb:ReportViewer BackColor="Transparent" ZoomMode="Percent"
width="100%" ProcessingMode="Remote" ID="ReportViewer1"
runat="server">
<ServerReport ReportPath="/myfolder/myreport"
ReportServerUrl="http://myserverr/reportserver" />
</rsweb:ReportViewer>

In my web config:

<compilation debug="true" strict="false" explicit="true">
<assemblies>
<add assembly="System.Data.OracleClient, Version=2.0.0.0,
Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="Microsoft.ReportViewer.Common, Version=8.0.0.0,
Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="Microsoft.ReportViewer.WebForms, Version=8.0.0.0,
Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
</assemblies>
<buildProviders>
<add extension=".rdlc" type="Microsoft.Reporting.RdlBuildProvider,
Microsoft.ReportViewer.Common, Version=8.0.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a"/>
</buildProviders>
</compilation>



<httpHandlers>
<add path="Reserved.ReportViewerWebControl.axd" verb="*"
type="Microsoft.Reporting.WebForms.HttpHandler,
Microsoft.ReportViewer.WebForms, Version=8.0.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a" validate="false"/>
</httpHandlers>

Thanks for any help or information.
 
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