Optional Lab

While going to optional labs it is just showing a blank page with small lock at the side ? how to resolve that issue

I hope you have subscribed for the course?

The small lock only shows if one has done the course and passed the period of months Coursera allows learner to have access to the material, labs and assignments.

You will have to report to the Coursera help centre.

Click the learner help centre and then choose accordingly based on the issue you could correlate on why you are encountering this issue.

If you have paid for subscription and currently doing the course, and yet noticing this issue, then let us know, so we can also inform coursera about this. But we would require your lab ID for this.