If you ever the the error message “Unrecognized attribute 'xmlns'.” appear in the browser.
the reason is because the .NET framework is set to version 1.1 and not 2.0. To fix this open IIS and right click the virtual directory, in this case CSSSearch and select Properties from the menu.
Click the ASP.NET tab and change the ASP.NET version to 2.0.
Click OK and that should be it.
