MIT kinect demos hand detector find user generator failed [closed]

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Hi, I'm trying to run the hand detector demo from MIT kinect demos package. I follow the setup steps in http://www.ros.org/wiki/mit-ros-pkg/KinectDemos/HandDetection. I'm working in a 11.10 Ubuntu machine with ros electric installed. When I run the hand detector demo I get the following error message:

Find user generator failed: this operation is invalid! [skel_tracker-9] process has died

Besides that in rviz the topics hand1-fullcloud and hand2 fullcloud do not receive any message.

Does anyone know how to solve this issue? Thank you