Gitlab-runner.service not found

My gitlab runner suddenly stopped working after a few weeks. I’m getting this error message.

“FATAL: Failed to start gitlab-runner: “systemctl” failed: exit status 5, Failed to start gitlab-runner.service: Unit gitlab-runner.service not found.”

Whatever command I try like restart, stop, start this error message shows up. If I type status it tells me the runner isn’t running and so does gitlab. Is there an easy fix for this?

Thank you very much for your supprot!