Hello,

I’m sorry for this inconvenience. To resolve this issue, please check your IIS version.
And if you’re IIS version is 7.0 or above, you should add webServer handlers in your web.config’s configuration.
Let me show you the handlers script:

<system.webServer><validation validateIntegratedModeConfiguration="false"/>
<handlers>
<add name="ISCoverFlow.axd_GET" path="ISCoverFlow.axd" verb="GET" type="ISNet.WebUI.Silverlight.WebAqua.WebCoverFlowRequestHandler, ISNet.WebUI.Silverlight.WebAqua" preCondition="integratedMode"/>
<add name="ISChart.axd_GET, POST" path="ISChart.axd" verb="GET, POST" type="ISNet.WebUI.WebGrid.Chart.ChartRequestHandler, ISNet.WebUI.WebGrid" preCondition="integratedMode"/>
<add name="ISRes.axd_GET" path="ISRes.axd" verb="GET" type="ISNet.WebUI.WebResourceHandler, ISNet.WebUI, Version=3.0.5000.1, Culture=neutral, PublicKeyToken=b1f2a8511635667a" preCondition="integratedMode"/>
<add name="WebFileUploaderHttpHandler.axd_GET" path="WebFileUploaderHttpHandler.axd" verb="GET" type="ISNet.WebUI.WebTextEditor.WebFileUploaderHttpHandler, ISNet.WebUI.WebTextEditor" preCondition="integratedMode"/>
<add name="ISScheduler.axd_GET" path="ISScheduler.axd" verb="GET" type="ISNet.WebUI.WebScheduler.WebSchedulerRequestHandler, ISNet.WebUI.WebScheduler" preCondition="integratedMode"/>
</handlers>
<modules>
<add name="WebFileUploaderHttpModule_GET" preCondition="managedHandler" type="ISNet.WebUI.WebTextEditor.WebFileUploaderHttpModule, ISNet.WebUI.WebTextEditor" />
</modules>
</system.webServer>

Hope this helps. Thank you.

Regards,
Hans.