Style Request: [COPPE/UFRJ] (fix the csl file)

I have a CSL file which already describes very well the format I need. Unfortunately, when I try to import it at Zotero, it gives me an error:

"citacao-coppe.csl" is not a valid CSL 1.0.1 style file, and may not work properly with Zotero.
Are you sure you want to continue?

If I choose YES, it gets added. However, I feel a bit insecure about writing long texts and risking losing the references. Besides I'd like to offer the file to the institution.

The file is here:
https://github.com/allangirao/citacao-coppe/raw/master/citacao-coppe.csl

And I don't know what is wrong with it.

I was able to easily open it at Mendeley's visual editor:
http://csl.mendeley.com/visualEditor/index.php

But it gives me an error whenever I try to save it.

The error message says:

Error saving the style:undefined
Message:Invalid style

Could anyone help me figuring out what is wrong with it?
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