xacro: error: expected exactly one input file as argument RLException: Invalid tag: Cannot load command parameter [robot_description]: command ……
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

Reason: There is an extra space before “/base .urdf.xacro”
Can run after modification
File names with spaces cannot be used in the workspace path where the ROS function package is located

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