在下载的古月居中，运行display_mbot_base_urdf.launch
报错 而且机器人的轮子无法显示
ERROR: cannot launch node of type [robot_state_publisher/state_publisher]: Cannot locate node of type [state_publisher] in package [robot_state_publisher]. Make sure file exists in package path and permission is set to executable (chmod +x)
解决方法：
只要将display_mbot_base_urdf.launch中的type修改
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