# Pastebin 9E8YXwXM
Apr 27 03:33:19 os-infra-1-neutron-server-container-0c950348 neutron-server[10906]: 2023-04-27 03:33:19.858 10906 CRITICAL neutron [req-5e4629a7-34d6-40e7-ac57-21cf17a2f4b9 - - - - -] Unhandled error: neutron_lib.callbacks.exceptions.CallbackFailure: Callback neutron.plugins.ml2.drivers.ovn.mech_driver.mech_driver.OVNMechanismDriver.pre_fork_initialize-267896 failed with "[Errno 2] No such file or directory: 'ovsdb-client'"
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron Traceback (most recent call last):
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron   File "/openstack/venvs/neutron-24.5.2.dev8/bin/neutron-server", line 8, in <module>
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron     sys.exit(main())
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron   File "/openstack/venvs/neutron-24.5.2.dev8/lib/python3.8/site-packages/neutron/cmd/eventlet/server/__init__.py", line 20, in main
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron     server.boot_server(wsgi_eventlet.eventlet_wsgi_server)
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron   File "/openstack/venvs/neutron-24.5.2.dev8/lib/python3.8/site-packages/neutron/server/__init__.py", line 67, in boot_server
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron     return server_func()
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron   File "/openstack/venvs/neutron-24.5.2.dev8/lib/python3.8/site-packages/neutron/server/wsgi_eventlet.py", line 24, in eventlet_wsgi_server
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron     neutron_api = service.serve_wsgi(service.NeutronApiService)
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron   File "/openstack/venvs/neutron-24.5.2.dev8/lib/python3.8/site-packages/neutron/service.py", line 94, in serve_wsgi
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron     registry.publish(resources.PROCESS, events.BEFORE_SPAWN, service)
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron   File "/openstack/venvs/neutron-24.5.2.dev8/lib/python3.8/site-packages/neutron_lib/callbacks/registry.py", line 60, in publish
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron     _get_callback_manager().publish(resource, event, trigger, payload=payload)
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron   File "/openstack/venvs/neutron-24.5.2.dev8/lib/python3.8/site-packages/neutron_lib/callbacks/manager.py", line 149, in publish
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron     return self.notify(resource, event, trigger, payload=payload)
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron   File "/openstack/venvs/neutron-24.5.2.dev8/lib/python3.8/site-packages/neutron_lib/db/utils.py", line 110, in _wrapped
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron     raise db_exc.RetryRequest(e)
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron   File "/openstack/venvs/neutron-24.5.2.dev8/lib/python3.8/site-packages/oslo_utils/excutils.py", line 227, in __exit__
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron     self.force_reraise()
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron   File "/openstack/venvs/neutron-24.5.2.dev8/lib/python3.8/site-packages/oslo_utils/excutils.py", line 200, in force_reraise
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron     raise self.value
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron   File "/openstack/venvs/neutron-24.5.2.dev8/lib/python3.8/site-packages/neutron_lib/db/utils.py", line 105, in _wrapped
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron     return function(*args, **kwargs)
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron   File "/openstack/venvs/neutron-24.5.2.dev8/lib/python3.8/site-packages/neutron_lib/callbacks/manager.py", line 174, in notify
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron     raise exceptions.CallbackFailure(errors=errors)
                                                                                    2023-04-27 03:33:19.858 10906 ERROR neutron neutron_lib.callbacks.exceptions.CallbackFailure: Callback neutron.plugins.ml2.drivers.ovn.mech_driver.mech_driver.OVNMechanismDriver.pre_fork_initialize-267896 failed with "[Errno 2] No such file or directory: 'ovsdb-client'"