phantomx_arm package problem: roslaunch phantomx_arm_description phantomx_upload.launch

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[robot_state_publisher-3] process has died [pid 16757, exit code 255, cmd /opt/ros/groovy/lib/robot_state_publisher/state_publisher __name:=robot_state_publisher __log:=/home/turtlebot/.ros/log/c6bbcc1e-c5f6-11e3-b45b-001b77993bf6/robot_state_publisher-3.log]. log file: /home/turtlebot/.ros/log/c6bbcc1e-c5f6-11e3-b45b-001b77993bf6/robot_state_publisher-3*.log

Pls give me a detailed explanation of how to solve it, thanks!