Hi Jerome,
I thinka that you have bug in robots.txt. Your code is
User-agent: *
Disallow: include/
Disallow: class/
Disallow: admin/
Disallow: template/
Disallow: lang/
Disallow: js/
Disallow: css/
Disallow: _files/
Your code not work in Google Search Console - Tools for test robots.txt file
New code in robots.txt works good
#CMS Robots File - Custom modification
#Last change NO 19042016
User-agent: *
Disallow: /include
Disallow: /class
Disallow: /admin
Disallow: /template
Disallow: /lang
Disallow: /js
Disallow: /css
Disallow: /_files
Thank you for your suggestion, but better would be probably:
You could also add the sitemap path within the robots.txt, like this:
Thanks.