Try log off and log back on to your account, rerun your code before submitting your lab:
Kernel → restart & clear all output
Cell → run all
save your work
submit
Here same issue comes for C1_W3_Logistic_Regression again. I did same things, log off and log back, restart & clear all output, run all and save. However, still cannot submit.
Hi. As Tom mentioned, that looks like a platform/account-related issue with Coursera. We can’t do anything about that on our side because we only manage the content.
You can include that submission dialog screenshot to their Learner Help Center so they’ll understand. If they continue to point you here, please let me know the ticket number you raised with them and I’ll try to escalate through our contacts. Thank you.