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

5
votes

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?

2
c#vstooutlook-addinoutlook-2010
what version of vsto is installed on test machine? – Brijesh Mishra
For what I had read it had intially suggested that 2010 comes with VSTO 3.0 installed. I had tried to install the 3.0 runtime however this would not install. I am goign to try the 2010 runtime microsoft.com/en-us/download/details.aspx?id=20479 as suggested by msdn.microsoft.com/en-us/library/ff937654.aspx – John
think VSTO 2010 RT is required for office 2010 addins – Brijesh Mishra
Installing the 2010 runtime did not help make any difference. – John
Are you sure the error isn't from the addin itself (like an unmanaged exception at startup) I have for ex, an addin that get disabled by office because of a timeout on an SqlConnection... – mslliviu

2 Answers

8
votes

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.

0
votes

ere are a couple of usefull sites (I'm not going to copy and paste their advice on troubleshooting) http://www.ceptara.com/node/183

http://blogs.msdn.com/b/vsod/archive/2008/04/22/troubleshooting-com-add-in-load-failures.aspx