Problem with quiz portal ,, cannot push my work

I tried 3 times to work on task " Linux Firewalld Setup " and each time it I finish the task, click finish then it takes very long to load and this message appears and I have to reload the session despite I didn’t lose connection to the terminal and I can work without problems

It has been more than 2 hours. I spend about 90 minutes trying (3 times * 30 minutes for doing the task) and it fails every time

Try to refresh the session and you will begin since the beginning

I already did this twice