Robot in simulation not displaying

the simulation has loaded but i am not able to see turtlebot/robot. its first step and its not even working

I also had simillar issue. First retry a few times, if problem persists this means some more serious issues. However if you are running simulation from launchfile provided by course this should be enough.

i tried many times but robot is not visible, its the first step when u launch a gazebo

@MuneebAk
What is the name of the course or rosject you are referring to?