That's not a Joomla 3.2 issue. That error is because you have an older version of the SourceCoast library installed and a newer version of JFBConnect. It's likely that you installed JFBConnect and then an older version of JLinked (which downgraded your library).
You should just need to re-install JFBConnect and that will fix everything up for you.
We've done a lot of testing with both the 5.1.2 release and even more with the upcoming v5.2 release, and things should work find on Joomla 3.2.