Skeleton tracking in ROS is not working.

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Hi all

I am using ROS Fuerte+Ubuntu 12.04. In skeleton tracking, I downloaded the pi_tracker and skeleton_markers package. Then I run the following commands:

 cd ~/ros_workspace/
 svn checkout http:_//pi-robot-ros-pkg.googlecode.com/svn/trunk/pi_tracker;
 svn checkout http:_//pi-robot-ros-pkg.googlecode.com/svn/trunk/skeleton_markers;
 cd pi_tracker/;
 rosmake/;
 cd ../skeleton_markers/
 rosmake/

I didn't get any error. Then I run roscore command in one terminal

In another terminal, I run roslaunch skeleton_markers markers_from_tf.launch, I was getting error How to solve

'No such file or directory: u'/opt/ros/fuerte/stacks/openni_camera/launch/openni_node.launch'?

I modified these errors with the help given in the following link :

http://answers.ros.org/question/43173/how-to-solve-no-such-file-or-directory-uoptrosfuertestacksopenni_cameralaunchopenni_nodelaunch/

but again when I run roslaunch skeleton_markers markers_from_tf.launch, it is showing the following error

[openni_tracker-22] process has died [pid 21752, exit code 18, cmd /opt/ros/fuerte/stacks/openni_tracker/bin/openni_tracker __name:=openni_tracker __log:=/home/jaya/.ros/log/851ade76-8d44-11e2-a6f7-a088b43d45c4/openni_tracker-22.log]. log file: /home/jaya/.ros/log/851ade76-8d44-11e2-a6f7-a088b43d45c4/openni_tracker-22*.log

Please help me. How could I do skeleton tracking in ROS fuerte+ubuntu 12.04.

thanks