If you havent figured it out yet (for me at lest) you need to right click on the folder that has those files in it and UN CLICK READ ONLY to make that box empty then click apply and build your solution.
If you havent figured it out yet (for me at lest) you need to right click on the folder that has those files in it and UN CLICK READ ONLY to make that box empty then click apply and build your solution.