Unfortunately, we lost some old, long unsused repositories recently. You can restore them by creating a new, empty repository in the project view and then pushing there using something like for x in $(git branch -r | grep -v HEAD); do git push origin $x:refs/heads/${x#*/}; done; git push --tags

The SSH username for accessing EduGit changed: Please update your remotes to use git@ instead of gitlab@.

No repository

The repository for this project does not exist.
This means you can not push code until you create an empty repository or import existing one.