Outlook Addin Error: Not loaded. A runtime error occurred during loading of COM add-in

c# vsto outlook-addin outlook-2010
John picture John · Jul 9, 2012 · Viewed 11.9k times · Source

I have created an VSTO Outlook addin. The configuration is as follows:

  • Visual Studio 2008
  • Office 2007 Outlook add in (3.5 Framework)
  • MSI created using Visual Studio Setup Project
  • Deployed to Office 2010 under windows 7

It works fine on the Dev PC however it fails to load once installed on the test machine. The outlook addin window shows a "Not loaded. A runtime error occurred during loading of COM add-in"

It is my understanding that I should not need to install any PIA as the Office 2007 PIA are part of Office 2010.

So far I have tried the following:

  • set VSTO_SUPPRESSDISPLAYALERTS however it does not show any messages when it tries to start.
  • configured Fuslogvw.exe (Assembly Binding Log Viewer) however it is not showing any binding errors.
  • set VTSO_LOGALERTS and it is logging all alerts however as none are shown this has not helped.

Is there anything I am doing wrong or need to do in addition to make this work?

Answer

Les picture Les · Jul 13, 2012

Make sure you have the VSTO 3.0 Runtime installed on the test machine.

You will also need to install the VSTO 3.0 Runtime Service Pack 1 if you are running Visual Studio 2008 Service Pack 1.

VSTO 4.0 Runtime is not required in your situation because it is used with add-ins created with Visual Studio 2010. Please note that the version of VSTO and runtime generally must agree with the version of Visual Studio used to create the add-in.

Related questions

How do I get the current mail item from Outlook ribbon context menu

I am creating an Outlook 2010 add-in and have added a context menu to my ribbon for idMso="contextMenuMailItem". On click, I would like to remove a category but in the click event handler, when I cast ctl.Context to MailItem, …

Read More
How to access Application property in VSTO Outlook add-in outside of ThisAddIn class?

ThisAddIn class created with new Outlook VSTO C# project has a Application property that you can use to among other things get access to Outlook folders and items. The problem is that you can easily use it when you're inside …

Read More
Storing Outlook emails in a Microsoft SQL Server database

I am using c# to write an Outlook 2007 add-in to store emails in a SQL Server 2005 database. I would like to be able to store the entire .msg file in a varbinary(MAX) field. Is there a way to do …

Read More