（ROS）roslaunch usb_cam-test.launch出现错误ERROR: cannot launch node of type [image_view/image_view]:

错误：
ERROR: cannot launch node of type [image_view/image_view]: image_view ROS path
[0]=/opt/ros/melodic/share/ros ROS path [1]=/home/ubantu/racecar_ws/src ROS
path [2]=/opt/ros/melodic/share [ERROR] [1636359179.072371227]: Cannot identify
'/dev/video0': 2, No such file or directory [usb_cam-2] process has died [pid
3531, exit code 1, cmd /opt/ros/melodic/lib/usb_cam/usb_cam_node
__name:=usb_cam
__log:=/home/ubantu/.ros/log/adf22956-406b-11ec-8e9d-000c29e78502/usb_cam-2.log].
log file:
/home/ubantu/.ros/log/adf22956-406b-11ec-8e9d-000c29e78502/usb_cam-2*.log

解决：

结果：再次运行roslaunch usb_cam usb_cam-test.launch可以出来

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