The issue is from some other Open Graph tags that are being inserted into the page. I'm not sure if those are from JomSocial or another extension. Specifically, these tags:
<meta property="og:see_also" content="/social"/>
<meta property="og:see_also" content="/social/grupo/display.html"/>
<meta property="og:see_also" content="/social/fotos/display.html"/>
<meta property="og:see_also" content="/social/videos/display.html"/>
<meta property="og:see_also" content="/publica-tu-evento/eventos/display.html"/>
Those are invalid tags because they don't have a full URL.
If you run that URL through the
Facebook URL Debug Tool
, you'll see there are errors because of those tags. Because of those errors, Facebook can't parse the actual tags on the page and won't let you create an action based off that page.
Please let me know what version of JomSocial you're using. We can help investigate further and see if this is something that should be fed back to them to improve their tags.
Thanks,
Alex