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Troubleshooting: The “Add-In Could Not Be Started” Error in MS Outlook for Windows

 

If you successfully installed the Add-In and configured your corporate firewall to let Revenue Inbox traffic through, yet on trying to open it in MS Outlook you get an error notification “ADD-IN ERROR. This add-in could not be started. Close this dialog to ignore the problem or click “Restart” to try again”, that might be caused an issue with RI Sidebar rendering. This article describes the ways to resolve the issue. The solutions are only applicable for MS Outlook Desktop for Windows.

 

 

Solution 1: Refresh Microsoft Browser Configuration

The error may occur with various Add-Ins / plugins installed in MS Outlook Desktop for Windows. The below guidelines are official ones provided by Microsoft.

The first step is to determine the versions of Windows OS and MS Outlook that you are using. These versions define which native Microsoft browser is used to render MS Outlook Add-Ins; that might be MS Edge or MS Internet Explorer.

See this Microsoft article to find out which one is used in your system based on your Windows version and Office package version combination. Users running the latest Windows 10 and Microsoft 365 Office updates typically have their Add-Ins rendered by MS Edge.

 

If your system uses MS Edge

Sometimes the error is caused by MS Desktop App Web Viewer getting corrupt. Take the steps below to re-install this module.

1. Close all MS Office apps running in your system, including MS Outlook
2. Run the following cmdlet in Windows PowerShell or command line on your PC, with Admin permissions:

powershell Add-AppxPackage -register -disable {Windows folder on system disk path e.g. C:\Windows\}\SystemApps\Microsoft.Win32WebViewHost_cw5n1h2txyewy\AppxManifest.xml

3. Run MS Outlook and try opening RI Add-In to see if the issue was resolved

 

If that does not help:

 


 

If your system uses Internet Explorer

In older versions of MS Windows and MS Outlook, Internet Explorer is used to render Outlook Add-Ins. There are several possible solutions for Internet Explorer:

 

Check your Internet Explorer

Make sure that you have the latest version of Internet Explorer installed, as described in this Microsoft article.

If needed, re-activate Internet Explorer in your Windows system:

1. Press the Windows key + R, type control and press Enter
2. Click Programs
3. Click Programs and Features
4. Select Turn Windows features on or off
5. Select the checkbox next to Internet Explorer 11
6. Reboot Windows to apply the changes, then check if the issue was resolved

   

Fix Internet Explorer Settings, if they got corrupt

1. Press the Windows key + R, type inetcpl.cpl and press Enter to open Internet Explorer’s Internet Options
2. Open the tab Advanced
3. Click Reset under Reset Internet Explorer Settings
4. Click Reset under Are you sure you want to reset all Internet Explorer settings?
5. As soon as the changes are applied, click Close and then OK
6. Reboot your Windows to apply changes, then check if the issue was resolved

   

Install System Updates

To get maximum performance and compatibility, all RI users are recommended to upgrade to Windows 10 build 1903 or above and Microsoft 365 / Office package version 16.013530 or above.

   

Enable Protected Mode in Internet Explorer

In case upgrading is not an option, you can try enabling Protected mode in MS Internet Explorer. To do that:

1. Close MS Outlook and any web browsers you use
2. Press the Windows key + R, type inetcpl.cpl and press Enter to open Internet Explorer’s Internet Options
3. Open the Security tab
4. Click Internet Sites zone
5. Select the checkbox Enable Protected Mode
6. Click OK
7. Restart MS Internet Explorer and Outlook
8. See if you can open the Add-In in MS Outlook now
9. If the issue persists, reboot your PC and try again

 

 

Add Revenue Grid to Trusted Sites

If the issue persists after enabling Protected mode:

1. Press the Windows key + R, type inetcpl.cpl and press Enter to open Internet Explorer’s Internet Options
2. Open the Security tab
3. Select Trusted sites under available zones
4. Click the button Sites
5. Add *.revenuegrid.com to the list
6. Restart MS Outlook and see if you can open the RI Add-In now

   

Contact Revenue Grid Support

If none of the above listed solutions resolves the issue, contact our Support team for further assistance.

   


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