Hello Fulgencio,

i had a look at your site, but everything seems correct for the robots.txt and the sitemap.

If Google Webmasters complains about not SEF urls as blocked, it looks like Google has cached a non-SEF version of the urls on your site, probably when the Joomla SEF was turned off.

To refresh the Joomla cache, submit an alternate sitemap links such as this:
http://www.cfsannicolas.com/component/jmap/sitemap/xml

This will force Google Webmasters to fetch new current SEF links avoiding warnings.

Thanks and best regards

John