gitlab-shell self-check failed

first, I apologize for my bad English.

I want to install gitlab on my server, but it wont works.
When I run sudo gitlab-rake gitlab:check, this error always comes up:

GitLab Shell: … GitLab Shell version >= 10.2.0 ? … OK (10.2.0)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: FAILED - Internal API error (404)
gitlab-shell self-check failed
Try fixing it:
Make sure GitLab is running;
Check the gitlab-shell configuration file:
sudo -u git -H editor /opt/gitlab/embedded/service/gitlab-shell/config.yml
Please fix the error above and rerun the checks.

Everything else works without errors.

I hope you can help me.