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Someone knows hoy to avoid the Warning

Warning [RaySensor.cc:206] ranges not constructed yet (zero sized)

in ROS fuerte?

I followed all the instructions I found but nothing works.

I just uncommented the turtlebot_body.urdf.xacro file, added the lines to the .launch files, (with some problems in last three added lines). I checked that patches are already applied, and I still get the warning message.

What can I do?

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