Simulation issues with first rosject for ROS basics in 5 days

Hey, I am doing my first rosject for ROS Basics in 5 days course (Part1: Topics) and have followed all the instructions correctly. For some reason I am getting errors while running the launch file for the simulation and the Gazebo shows an empty screen. The document shows that a robot in a track environment must appear. I don’t understand what to do, as there aren’t any instructions to deal with this issue.
Could anyone help me with this?

Hi @Kunal007 ,

Sometimes it may happen that gazebo starts with the zoom very close to the ground, and it may appear the world is empty.

Could you attach a screenshot?
Furthermore, could you try zomming out using the mouse wheel to make sure you can see the simulation properly?