Thanks for the link. The error I'm getting is actually at step 2 of the process. Bootcamp asks for a Windows ISO image and the size of the Windows partition. I have downloaded the ISO image from Microsoft site, select it in Bootcamp and when I click "Install", I receive the error. The signature of the ISO matches the one from Microsoft site so the download is good.
I have tried to create an image from a Windows computer and I still receive the same error.
I'm thinking that maybe some bootcamp settings could be done. I have found some pages for older versions not for my current version.