I have completed all things but cannot submit. I try to save but there was a problem.
Can somebody help me please 
Hello @anh.nguyence0912!
Several learners facing this issue. We informed the course staff to look into the issue as soon as possible. So, we request you wait for a while.
Best,
Saif.
1 Like
Thanks for your information.
Hope it will be solved soon
Yeah. We will inform you once it is solved.
Best,
Saif.
Facing the same issue, would like to know as well once it is solved. Thank you.
Hello @pattongao!
We are extremely sorry for the inconvenience. Several learners facing this issue, so we request you wait for a while. We informed the course staff to look into the issue as soon as possible.
Once they resolve the issue, we will inform you.
Best,
Saif.