Added new kb article error-opening-reports-report-server-standalone-designer (#1732)

* Added new kb article error-opening-reports-report-server-standalone-designer

* Update error-opening-reports-report-server-standalone-designer.md

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Co-authored-by: KB Bot <[email protected]>
Co-authored-by: Dimitar Nikolov <[email protected]>

Author: 3 people

knowledge-base/error-opening-reports-report-server-standalone-designer.md

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+---
+title: Error When Opening Reports Stored on Report Server in Standalone Report Designer
+description: "Learn how to resolve the error about multiple request actions when opening reports stored on the Telerik Report Server in the Standalone Report Designer."
+type: troubleshooting
+page_title: Standalone Report Designer Cannot Open Report Server Reports
+meta_title: Reports Stored on the Report Server Cannot be Opened in the Report Designer
+slug: error-opening-reports-report-server-standalone-designer
+tags: telerik report server, standalone report designer, system.net.http, binding redirect, web.config
+res_type: kb
+ticketid: 1691680
+---
+
+## Environment
+<table>
+   <tbody>
+      <tr>
+         <td> Product </td>
+         <td> Progress® Telerik® Report Server </td>
+      </tr>
+      <tr>
+         <td> Designer</td>
+         <td> Standalone Report Designer</td>
+      </tr>
+   </tbody>
+</table>
+
+## Description
+
+I encounter an error when attempting to open a report stored on [Telerik Report Server](https://www.telerik.com/report-server) in the [Standalone Report Designer]({%slug telerikreporting/designing-reports/report-designer-tools/desktop-designers/standalone-report-designer/overview%}). The error mentions a conflict in the HTTP controller due to multiple actions matching the same request.
+
+## Error Message
+
+```
+w3wp.exe Error: 0 : Operation=ApiVersionActionSelector.SelectAction, Exception=System.InvalidOperationException: Multiple actions were found that match the request: 
+GetClientsSessionTimeoutSeconds on type Telerik.ReportServer.Web.Controllers.Api.ReportsController
+GetClientsSessionTimeoutSeconds on type Telerik.ReportServer.Web.Controllers.Api.ReportsController
+   at Microsoft.Web.Http.Controllers.ApiVersionActionSelector.SelectActionVersion(HttpControllerContext controllerContext, IReadOnlyList`1 candidateActions)
+   at Microsoft.Web.Http.Controllers.ApiVersionActionSelector.ActionSelectorCacheItem.FindAction(HttpControllerContext controllerContext, Func`3 selector, Boolean ignoreSubRoutes)
+   at Microsoft.Web.Http.Controllers.ApiVersionActionSelector.ActionSelectorCacheItem.SelectAction(HttpControllerContext controllerContext, Func`3 selector)
+   at System.Web.Http.Tracing.Tracers.HttpActionSelectorTracer.<>c__DisplayClass7_0.<System.Web.Http.Controllers.IHttpActionSelector.SelectAction>b__0()
+   at System.Web.Http.Tracing.ITraceWriterExtensions.TraceBeginEnd(ITraceWriter traceWriter, HttpRequestMessage request, String category, TraceLevel level, String operatorName, String operationName, Action`1 beginTrace, Action execute, Action`1 endTrace, Action`1 errorTrace)
+```
+
+## Cause
+
+ An older version of the `System.Net.Http` assembly may exist in the [Global Assembly Cache (GAC)](https://learn.microsoft.com/en-us/dotnet/framework/app-domains/gac) and is being loaded by the Report Server.
+
+## Solution
+
+1. Open the `Web.config` file of the Report Server located at: `C:\Program Files (x86)\Progress\Telerik Report Server\Telerik.ReportServer.Web\Web.config`.
+1. Locate the [<dependentAssembly>](https://learn.microsoft.com/en-us/dotnet/framework/configure-apps/file-schema/runtime/dependentassembly-element) element and add the following [<bindingRedirect>](https://learn.microsoft.com/en-us/dotnet/framework/configure-apps/file-schema/runtime/bindingredirect-element) for the `System.Net.Http` assembly:
+
+   ````XML
+<dependentAssembly>
+       <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
+       <bindingRedirect oldVersion="0.0.0.0-4.2.0.0" newVersion="4.2.0.0"/>
+   </dependentAssembly>
+````
+
+
+1. Save the `Web.config` file (*administrator permissions may be required*).
+1. **Recycle the Application Pool** and restart the **Telerik Report Server** website from the [IIS Manager](https://learn.microsoft.com/en-us/iis/get-started/getting-started-with-iis/getting-started-with-the-iis-manager-in-iis-7-and-iis-8).
+1. (*Optional*) If the error persists, try restarting the Internet Information Services (IIS) by executing the following command in a Command Prompt/PowerShell
+
+   ````CMD
+iisreset
+````
+
+
+## See Also
+
+* [Troubleshoot Report Server Manager](https://docs.telerik.com/report-server/knowledge-base/troubleshoot-report-server)  
+* [IIS Manager](https://learn.microsoft.com/en-us/iis/get-started/getting-started-with-iis/getting-started-with-the-iis-manager-in-iis-7-and-iis-8)