`systemctl status atop` shows it has failed, but there is no error message

I installed atop, and then immediately upgraded from Fedora 29 to Fedora 30. Now atop failed to start during boot. But there is no error message. It only shows that atop exited with code 7. Why do I not see an error message? $ rpm -q atop atop-2.4.0-1.fc30.x86_64 $ journalctl -u atop -- Logs begin at Wed 2018-02-28 17:23:24 GMT, end at Tue 2019-04-30 22:41:24 BST. -- Apr 30 17:27:05 fedora29-vm systemd: Started Atop advanced performance monitor. Apr 30 18:34:31 fedora29-vm systemd: Stopping Atop advanced performance monitor... Apr 30 18:34:34 fedora29-vm systemd: Stopped Atop advanced performance monitor. -- Reboot -- Apr 30 19:48:56 fedora29-vm systemd: Started Atop advanced performance monitor. Apr 30 19:48:58 fedora29-vm systemd: atop.service: Main process exited, code=exited, status=7/NOTRUNNING Apr 30 19:48:58 fedora29-vm systemd: atop.service: Failed with result 'exit-code'.