C3W3Lab1 issue with connection string

Course: Data Engineering C3W3Lab1 - Row vs Columns storage

I followed these instructions:

Having previously copied the endpoints URLs from:

So, what’s the problem here? I haven’t evenr reached the part where I have to write in the code cells, so the only thing I did until this point is to copy the urls endpoints from cloudformation and paste them in the env file.
Thanks.

And when running the next 2 cells I get these messages, which if I understand right, says that there is something wrong with the connection string:

And later it says that there is a missing env variable.