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i'm sorry! it doesn't work! i see the message:

and

[robot_state_publisher-4] process has died [pid 3564, exit code 255]. log files: /home/mauro/.ros/log/a7c008f2-2571-11e1-ab8c-0016ea548718/robot_state_publisher-4*.log

i'm sorry! it doesn't work! i see the message:

[ERROR] [1323770587.771294297]: Could not find parameter robot_description on parameter server

[ERROR] [1323770587.771406602]: Could not generate robot model

[ERROR] [1323770587.771439008]: Failed to extract kdl tree from xml robot description

and

[robot_state_publisher-4] process has died [pid 3564, exit code 255]. log files: /home/mauro/.ros/log/a7c008f2-2571-11e1-ab8c-0016ea548718/robot_state_publisher-4*.log