Not loaded. A runtime error occurred during the loading of the COM add-in.

Question

I am getting "not loaded. A runtime error occurred during the loading of the COM add-in." message when trying to add the Teams meeting add-in i n outlook (office 365 pro plus).

Any help is appreciated on this.

Thanks,

Sudheer.

Answer 1

Hi Sudheer,

Thanks for your posting.

Give your problem, I recommend you can follow the steps below to troubleshoot your issue:

1. Open registry editor and go to “HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins” to check whether your add-in is installed correctly. By default, the value of LoadBehavior is “3”, with which the VSTO Add-in will be loaded when you launch Outlook, if LoadBehavior value of your add-in is not “3”, you can try to change it to “3”.

2. Start Outlook to see whether the add-in works well. If the add-in shows up at “Active Application Add-ins” and the status of “Load Behavior” is Load at Startup, it should work well.
3. If the problem still exists, you can check the error via right-clicking This PC to Properties, and then go to Advanced system settings > Environment Variables > New to add a new system variable, the variable name is “VSTO_SUPPRESSDISPLAYALERTS”, the variable value is “0”. In addition, open the registry editor and go to “HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins” to set the LoadBehavior of your add-in to be “3”. Then when you restart Outlook client, there will be pop-up dialog describing what the error is, and share the screenshot with me.
4. Follow this link to re-enable the add-in.

For detailed information, you can refer to My Office Addin does not Load!, the article is related to Excel add-in, which you can refer to.

If the issue persists, please offer me following information for further analysis:

1. Did other members in your organization have the same issue?
2. The related screenshots of your operation process.
3. The version of your Outlook client.

Best Regards,

Betty

Answer 2

Hi Sudheer,

Have you checked my suggestions to troubleshoot your issue?

Best Regards,

Betty