Unable to submit Week 2 Practice Lab: linear regression

Course Q&A Machine Learning Specialization Supervised ML: Regression and Classification
1

I did this practice lab but I was late. Although I did the practice many times and get the right results, the platform still marks the Practice as NOT SUBMITTED. Could somebody help me? I don’t know if this problem could prevent I complete the course. Thanks in advance.

2

Have you clicked on submit button on top of the exercise page?