404 page not found returned by only one project in server and this project's master branch is removed

like title, only one project in my server returning 404 error.
So I can reach projects page, but I can’t access to my main project.
And master branch which I did not remove is missing.
This happened when I turn off server pc.

I tried reconfigure and restart gitlab (gitlab-ctl restart), but nothing changed.
How can I solve this problem?