Problems displaying webpage in HTML course

Hi!

I’m having some problems displaying my webpage in the html course. Whenever I click “run” I get a message that says apdps11qp9qqjftcors30khib99lrkq45333tevnj23r01mdq3k0.cc-propeller.cloud’s server IP address could not be found. Has anybody experienced this issue / know why it might be happening? It’s holding me back from continuing in the course.

Below is a picture of the issue.

Thanks!

ihave same problem here
5c28c0a23eb64052bdd35a3de59f3f34.cc-propeller.cloud ’s server IP address could not be found.

I would really like to learn coding but I’m Bipolar. So I have a problem with my attention I can’t understand anything they talk about they could be speaking Japanesse and I wouldn’t know the difference