RLException: Invalid ＜param＞ tag:
问题：RLException: Invalid <param> tag: Cannot load command parameter [robot_description]: command [['/opt/ros/melodic/lib/xacro/xacro', '/home/rot/catkin_ws/src/rot_cararm/urdf/robot_base/base.urdf.xacro']] returned with code [2].
Param xml is <param command="$(find xacro)/xacro $(find rot_cararm)/urdf/robot_base/base.urdf.xacro" name="robot_description"/>
The traceback for the exception was written to the log file
原因：base.urdf.xacro文件有个路径给错
<xacro:include filename="$(find rot_cararm)/urdf/robot_base/base.gazebo.xacro" />
因为是拷贝他人项目，路径文件名没有更改为自己设置的
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