Your using another Facebook extension, it looks like for a "Like" button. That button is re-including the Facebook javascript API and conflicting with JFBConnect's initialization of the API.. causing the error.
You'll need to disable that other extension, or at the least, remove it's code block that loads the Facebook Javascript file "all.js". JFBConnect has easy ways to add similar Like buttons to your site.
Hope that helps, but if you have other questions, just let us know!
Alex