http://msmvps.com/blogs/carlosq/archive/2008/11/28/the-strange-case-of-lt-unknown-error-gt-8013141a-loading-a-visual-studio-add-in.aspxA developer posted a couple of days ago in the MSDN forum about Visual Studio Extensibility that loading his add-in caused and exception with error number &lt;Unknown Error&gt; (8013141A) . Of course, searching with Google doesn&#39;t always offer muchenCommunityServer 2008.5 SP2 (Build: 40407.4157)http://msmvps.com/blogs/carlosq/archive/2008/11/28/the-strange-case-of-lt-unknown-error-gt-8013141a-loading-a-visual-studio-add-in.aspx#1697098Mon, 29 Jun 2009 12:39:24 GMTd67277c4-116b-43f1-b688-e9ef184ea916:1697098Carlos Quintero (Microsoft MVP) blog<p>From time to time I blog about strange cases of errors when loading add-ins for Visual Studio. At least</p> <img src="http://msmvps.com/aggbug.aspx?PostID=1697098" width="1" height="1">