Problem with stereo and monocular calibration on openni_kinect

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Hello, Im trying to get my kinect stereo calibrate so I was following this tutorial:

http://www.ros.org/wiki/camera_calibration/Tutorials/StereoCalibration#Before_Starting

but when I try $ rostopic list, it doesn't show any of the /my_stereo.../ and when I tried

rosrun camera_calibration cameracalibrator.py --size 8x6 --square 0.108 right:=/my_stereo/right/image_raw left:=/my_stereo/left/image_raw right_camera:=/my_stereo/right left_camera:=/my_stereo/left

I got: "Waiting for service /my_stereo/left/set_camera_info ... Service not found Waiting for service /my_stereo/right/set_camera_info ... Service not found"

I also tried the Monocular Camera calibration on: http://www.ros.org/wiki/camera_calibration/Tutorials/MonocularCalibration and got the same problem "Waiting for service /camera/set_camera_info ... Service not found" with $ rosrun camera_calibration cameracalibrator.py --size 8x6 --square 0.108 image:=/camera/image_raw camera:=/camera

What im doing wrong? What should I do? Im working on ubuntu 12.04 and ros fuerte.

thanks!