i can't submit the final project

[mehrzadmo586-rgb]

Hello,

I am trying to submit my CS50x 2026 Final Project with:

submit50 cs50/problems/2026/x/project

The submission reaches "Uploading..." and then fails.

Debug output shows:

fatal: cannot lock ref 'HEAD':
'refs/heads/cs50/problems/2026/x/project/implementation' exists;
cannot create 'refs/heads/cs50/problems/2026/x/project'

My repository is:
me50/mehrzadmo586-rgb

The branch
cs50/problems/2026/x/project/implementation
is currently the default branch, and I do not have repository admin access to change or rename it.

Could you please fix/reset the project submission branch so I can submit to:
cs50/problems/2026/x/project
?

Thank you.