Sorry to read that you are having these issues. It seems like a server problem. Try to contact the Coursera Support Chat and copy-paste them the error. They will be willing to confirm if there is something going on at the servers.
Hi Thomas and Ravi! Welcome to the community! Can you post here the link in the classroom (i.e. the one with the Work in Browser button)? The assignment for this week is titled “Linear Regression” so you might be referring to another notebook. Thanks.
Thomas, I am afraid the only option, in this case, will be to contact the Teaching staff directly creating your own post in the forum where the previous one has been created. The Teaching staff will be providing further information and details about it.
Glad to read that everything is fine now
Just to clarify, we mentors cannot fix anything on the server side, only the technical support from Coursera can do it