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我在用ROS跑点云图时，遇到如下问题，请问该如何解决？
请问您用的是哪个版本的toolbox里的ROS demo?
请问是按照上面文档里的步骤操作的吗？使用的是Ubuntu 18.04 LTS吗?
上面的报错信息是执行到哪一步出现的？
