fingerdetection in MIT's mit-ros-pkg didn't run well

edit

When I ran the finger_detection demo in MIT's mit-ros-pkg. It had no compiling error and ran OK and the prime sense viewer successfully tracked person's skeleton.

But the finger data didn't show in Rviz. The messages from /finger_norms topic didn't show the yellowing WARNING and are said to be received but the line segment which should have represent the finger direction didn't show on screen.

I rostopic echo the /finger_norms and get the following result.

What does it mean?

> ~$rostopic echo /finger_norms header:   
> seq: 80   stamp: 
>     secs: 1324897142
>     nsecs: 445125858   frame_id: /openni_rgb_optical_frame polygons: []
> chan: []
> --- header:    seq: 81   stamp: 
>     secs: 1324897231
>     nsecs: 344789294   frame_id: /openni_rgb_optical_frame polygons: []
> chan: []
> --- ^C

I am using ROS electric and UBUNTU 10.10.

Thanks.