Henrik,
Not sure what version of the K2 Profile plugin you're using, but that line doesn't exist in the 4.2.0 version, which is the latest release. Can you please upgrade? On the Overview page of JFBConnect, make sure all the versions are up-to-date, or at least within the same minor release series (4.1.x or 4.2.x).
If that doesn't help, let me know!
Thanks,
Alex