This error means that another extension, plugin or template on your site is including Facebook's deprecated all.js Javascript library. That is the 'old' version of the Facebook Javascript API which was discontinued. It's no longer meant to be used and can cause conflicts with some JFBConnect features, as JFBConnect uses the recommended sdk.js library. Some common extensions that included Facebook features are JomSocial, EasySocial, K2. You will need to check your plugins, components and/or template for any Facebook features and try to disable them.
-Melissa
Facebook Error During Test
