1、先实验一波urdf在rviz里面能否正常打开
2、运行：
roslaunch ur120 display.launch
会出现错误
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)
接着可以看到rviz里面也加载不出来正常模型
修改方法：这里，修改后效果如下：
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