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

1. Right click on the project, click Publish
2. Goto Settings -> File Publish Options
3. Uncheck Precompile during publishing

This will prevent the web.debug.config/web.release.config injecting the file back to the web.config if you are using visual studio publish.