C2_W2 optimisation methods programming assignement saving probelem

so im doing this coding assignement and as im working in the juputer lab it says at the top that the permssion is denied and that i cant submit my work and even modifications arent even saved , what should i do ive been facing this probelem for a week now everytime i say its abug and i should do all the assignement all over again , its preventing me from continue the course since i want to pass it.
pls help

On the top right of this Jupyter notebook, go to Help and then get latest version. Hope this will solve your issue. If not, let us know.

Best,
Saif.