http://developers.de/blogs/damir_dobric/archive/2011/03/18/cannot-start-wcf-web-service-because-of-aspnetadapter-failure.aspxImaging you have a WCF Web Service which works fine. Unfortunately it can happen that following error occurs when somebody else try to start the service: Could not load file or assembly &#39;Microsoft.VisualStudio.QualityTools.HostAdapters.ASPNETAdapterenCommunityServer 2008 SP1 (Build: 30619.63)http://developers.de/blogs/damir_dobric/archive/2011/03/18/cannot-start-wcf-web-service-because-of-aspnetadapter-failure.aspx#437205Thu, 08 Nov 2012 19:49:51 GMT7e491611-45ad-4dae-a68f-c4cb64439510:437205.NETDeveloper<p>Excellent !! Worked perfectly.</p> <p>Found many other articles on this but all provided workarounds to comment out the code in Web.config. This is the actual solution. Well done on tracing down to the root !</p> <div style="clear:both;"></div><img src="http://developers.de/aggbug.aspx?PostID=437205" width="1" height="1">