Shell and simulations windows not loading

I have issues with the environment. The shell and simulation windows not loading from friday in this course. Also i have tried in the rosject of this course and in this only not works the simulation window.

Looking into it right now. I can confirm that this is happening.

We have fixed this issue. Please try again now. I apologize for the inconvenience.

i just tried and simulation and shell windows works fine. Thanks for resolve the problem.