object_recognition_core failed to run corre

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hello, Im fairly new here and I've been trying ROS for fun for a few days and finally got stuck at object_recognition_core.

I finished the installation of fuerte on Ubuntu 12.04 and then object_recognition from the ROS repositories:

sudo apt-get install ros-fuerte-object-recognition-core

Then I followed the quick guide of this page:
(ecto.willowgarage.com/recognition/ros_quickguide.html)
unfortunately,I failed to run this in the third Terminal:

rosrun object_recognition_core orb_template.py -o my_textured_plane

 it says:

[rosrun] Couldn't find executable named orb_template.py below /opt/ros/fuerte/share/object_recognition_core

 Anyone knows how to solve this?