Hi guys

I am new to ROS and I am trying to view a robot in rviz. however when I try to view it in rviz it gives a warning under robotstate that no msg received.

In the terminal I get the following error.

[ERROR] [1599477561.794250698]: Robot semantic description not found. Did you forget to define or remap '/robotdescriptionsemantic'?

Does anyone know how to fix it? Many thanks Amir