While starting "osad" service it fails with error "No module named spacewalk.common.usix"

Issue

• While starting osad service it fails with below error

systemctl status osad
● osad.service - OSAD daemon
   Loaded: loaded (/usr/lib/systemd/system/osad.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Fri 2017-10-13 10:51:11 CEST; 49s ago
  Process: 17080 ExecStart=/usr/sbin/osad --pid-file /var/run/osad.pid (code=exited, status=1/FAILURE)

Oct 13 10:51:11 afb-app-jen-013.cw.lan systemd[1]: Starting OSAD daemon...
Oct 13 10:51:11 afb-app-jen-013.cw.lan osad[17080]: Unable to load module osad
Oct 13 10:51:11 afb-app-jen-013.cw.lan osad[17080]: No module named spacewalk.common.usix
Oct 13 10:51:11 afb-app-jen-013.cw.lan systemd[1]: osad.service: control process exited, code=exited status=1
Oct 13 10:51:11 afb-app-jen-013.cw.lan systemd[1]: Failed to start OSAD daemon.
Oct 13 10:51:11 afb-app-jen-013.cw.lan systemd[1]: Unit osad.service entered failed state.
Oct 13 10:51:11 afb-app-jen-013.cw.lan systemd[1]: osad.service failed.