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roslaunch error

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I tried to run **roslaunch excavator_gazebo gazebo.launch** (using kinetic) ============================================================================== But I got this error : xacro: Traditional processing is deprecated. Switch to --inorder processing! To check for compatibility of your document, use option --check-order. For more infos, see http://wiki.ros.org/xacro#Processing_Order XML parsing error: unbound prefix: line 5, column 2 when processing file: /home/kmj/catkin_ws/src/excavator_description/urdf/excavator.xacro Check that: - Your XML is well-formed - You have the xacro xmlns declaration: xmlns:xacro="http://www.ros.org/wiki/xacro" Invalid tag: Cannot load command parameter [description]: command [/opt/ros/kinetic/share/xacro/xacro.py '/home/kmj/catkin_ws/src/excavator_description/urdf/excavator.xacro'] returned with code [2]. Param xml is The traceback for the exception was written to the log file ============================================================================== I have no idea to solve this problem. Do you know how to fix this?

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