Comment 15 for bug 985121

Ginn says "error when subscribing to gestures" because there is already an instance of ginn running.

Try sudo killall ginn before running it, and you should be okay.

If it still does not work, try following the instructions here: http://ubuntuforums.org/showthread.php?t=1419833

There's lots of great advice there, both of the first two posts worked for me.