Problems in the multi-robot simulation using my own scene

I have followed the document of isaacSim to build my own multi-robot simulation scene at the same place with the medium_warehouse. but when i run the simulation substitute the medium_warehouse with my scene the simulation could not show my scene. I dont know how to solve the problem

Hi weihuanshu, could you list the steps you use to run the simulation with your own scene? Were you able to run a single robot simulation with your own scene first, before running the multirobot sim?