Hey @Damieno, @Jian_Xu1, @xin_xu and @Ivaniuk_Petro,
Welcome, and we are glad that you could be a part of our community 
This issue has been reported by another learner, and I have raised concerns regarding this with the team, and it has been fixed. It might take some time to reflect in your notebooks. In the meanwhile, you can follow this thread, resolve the issue manually, and pass the auto-grader. Let us know if we can help you out in any other way.
Cheers,
Elemento