getting <class ‘NoneType’> error
Dear Merovigian,
Please note that I normally restart the lab on the kernel. Please refer to this image:
Check whether you renamed your notebook file.
The grader always uses the default notebook file name, regardless of what notebook you have open when you click on “Submit”.
So you can’t rename a notebook and then try to have it graded.
You should be able to use the “Help” button in the upper right corner of the lab, and use “Get Latest Version”.
I see you deleted your posts. Is everything ok?