thanks for allowing me access to your server, so I could investigate the error messages.
I fixed up the "assign.marking.html" file in the marking block, and the error messages have gone.
In due course, I will report these fixes to the maintainers of the marking block - although at the moment, I am not quite sure where to make contact with them
best regards
Gordon
P.S. Please could you remove me as a teacher from your course now. Thanks!