Problems installing windows 10 with bootcamp.

The process starts, downloads compatibility software, creates the partition but then stops with the below message (free translation from spanish, then deletes the partition and finishes. What can be the problem? I have tried using an USB with the iso image, from a folder within the desktop or a folder in documents, non is working. PLEASE HELP!!! i have not found any light searching with google. I have High sierra on a late 2015 iMac i7, 2tb ssd and 32ram.

"Error installing bootcamp. There was an error when copying Windows installing files"