turtle_tf not working [closed]

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Hi everyone,

I'm trying to do the tf Tutorial, which begins by running turtle_tf.

When I do it, it launches and then shortly after, outputs this :

Traceback (most recent call last):
  File "/opt/ros/fuerte/stacks/geometry_tutorials/turtle_tf/nodes/turtle_tf_listener.py", line 57, in <module>
    (trans,rot) = listener.lookupTransform('/turtle2', '/turtle1', rospy.Time())
tf.ExtrapolationException: Lookup would require extrapolation into the past.  Requested time 1345710088.638981104 but the earliest data is at time 1345710089.055480003, when looking up transform from frame [/turtle1] to frame [/turtle2]
[turtle_pointer-5] process has died [pid 3906, exit code 1, cmd /opt/ros/fuerte/stacks/geometry_tutorials/turtle_tf/nodes/turtle_tf_listener.py __name:=turtle_pointer __log:=/home/mario/.ros/log/7f3d67d8-ecfb-11e1-8351-f46d044b0908/turtle_pointer-5.log].
log file: /home/mario/.ros/log/7f3d67d8-ecfb-11e1-8351-f46d044b0908/turtle_pointer-5*.log

The turtle simulator runs, but the 2nd turtule does not move.

It looks like this bug : http://www.ros.org/wiki/tf/Tutorials/Introduction%20to%20tf except it was supposedly solved 3 years ago.

Anyone has an idea ?