Robot semantic description not found. Did you forget to define or remap '/robot_description_semantic'? error

I ran rivz and added robotmodel as instructed in ROS Basics in 5 days. However, the robot model did not appear and the following error occurred. What should I do? ( Example 1.4 in ROS Basics in 5 days.)

The robot model should appear automatically, so please try again.

You can also try removing the RobotModel item and add it again

thank you i resolve it

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