gazebo cannot load the generated .world file

[Derekzcx]

I use the gazebo generate_world.world command to open the .world file, but gazebo is started but the screen is black, and it automatically closes in about 1 minute. Why is this? I am using gazebo version 9.0, is it a version problem? Or there are other problems that I didn't pay attention to, I hope you can advise, thank you.