http://msmvps.com/blogs/kevinmcneish/archive/2006/12/17/create-instance-failed-in-object-test-bench-culprit-enable-sql-server-debugging.aspxI've had a number of developers ask me about encountering the "Create Instance Failed" error messsage when instantiating an object at design time in conjunction with the Object Test Bench. I was able to consistently reproduce this error by turning onenCommunityServer 2008.5 SP2 (Build: 40407.4157)http://msmvps.com/blogs/kevinmcneish/archive/2006/12/17/create-instance-failed-in-object-test-bench-culprit-enable-sql-server-debugging.aspx#435208Wed, 20 Dec 2006 03:40:33 GMTd67277c4-116b-43f1-b688-e9ef184ea916:435208KevinMcNeish<p>You will also get this error if you are working in a Web project. If you disable the Web site from being compiled you can get past this error.</p> <p>Best Regards,</p> <p>Kevin McNeish</p> <div style="clear:both;"></div><img src="http://msmvps.com/aggbug.aspx?PostID=435208" width="1" height="1">http://msmvps.com/blogs/kevinmcneish/archive/2006/12/17/create-instance-failed-in-object-test-bench-culprit-enable-sql-server-debugging.aspx#428629Sun, 17 Dec 2006 18:42:22 GMTd67277c4-116b-43f1-b688-e9ef184ea916:428629Michael Neel<p>I'm using VS2005 and my project is a Web Project. &nbsp;I don't have &quot;Properties&quot; at the project level (only solution level), but instead have &quot;Property Pages&quot;. &nbsp;In Property Pages, under start options, is a Debuggers list with ASP.NET, Native code, and SQL Server checkboxes. &nbsp;Playing with these had no effect on the error.</p> <p>I'm not sure if these checkboxes do the same thing as the ones you are referring to. &nbsp;Also, I'm not yet running SP1 since I'm still looking into all of the changes it brings.</p><div style="clear:both;"></div><img src="http://msmvps.com/aggbug.aspx?PostID=428629" width="1" height="1">