Unable to override View layout on File document type on Designer

I'm following this howto on my sandbox on branch feature/tuto-wiki-related-doc.

I've created the 3 elements and the automation scripting, I'm trying to call my custom element on the View layout of the file document type to display the related document. But when I copy paste the content and click on save, I have an error in the log and it doesn't save my changes.

I've attached the conf of the file doc type and the log.