Web.config transformation: Unrecognized attribute 'xmlns:xdt'. Note that attribute names are case-sensitive

Question

I\'m getting this strange intermitent bug in a MVC 3.0 project When I build the project sometimes I get the following error message:

Unrecognized attr

Answer 1

just remove the xmlns:xdt attribute from the web.config, but keep it in web.release.config and web.debug.config.

Your transform will still work - and so will your website.