DLS:course 5:W3:A2 Notebook does not load

I am unable to open the assignment 2 of week 3. Every time i refresh it i get the same error as follows:
"# We’re having trouble preparing your lab

Hit refresh to try again and make sure you’re logged into Coursera"

I am able to open my previously completed assignments. I tried to navigate to the A2 assignment through A1, but i cannot find the folder. I cleared the outputs of A1 to clear the kernel, to check if that helps. The problem persists.
Suggest me the way out.