I know this has been asked before, but none of the proposed solutions work for me. I had hosed up my OpenStack (Ocata) lab system so bad that I decided to uninstiall openstack-packstack, reinstall, and run packstack --allinone

192.168.140.218_controller.pp:                    [ ERROR ]              
Applying Puppet manifests                         [ ERROR ]

ERROR : Error appeared during Puppet run: 192.168.140.218_controller.pp
Error: Systemd start for openstack-nova-api failed!
You will find full trace in log /var/tmp/packstack/20170428-200118-XZ0lKC/manifests/192.168.140.218_controller.pp.log

OK, so I look in that file and see this, over and over:

pr 28 19:58:09 kvm8.mia.ccncore.net systemd[1]: openstack-nova-api.service: main process exited, code=exited, status=1/FAILURE
Apr 28 19:58:09 kvm8.mia.ccncore.net systemd[1]: Failed to start OpenStack Nova API Server.
Apr 28 19:58:09 kvm8.mia.ccncore.net systemd[1]: Unit openstack-nova-api.service entered failed state.
Apr 28 19:58:09 kvm8.mia.ccncore.net systemd[1]: openstack-nova-api.service failed.
Apr 28 19:58:09 kvm8.mia.ccncore.net systemd[1]: openstack-nova-api.service holdoff time over, scheduling restart.
Apr 28 19:58:09 kvm8.mia.ccncore.net systemd[1]: Starting OpenStack Nova API Server...s exited, code=exited, status=1/FAILURE

Can anyone give me a clue what this means? I uninstalled the previous packstack but apparently it doesn't all get deleted.