The 1.15.0 release of neutron-lib contains a syntax error in a LOG debug call that was fixed with [1]. We are working to release the fix with 1.16.0 [2]. If you are running into this error [3], it maybe necessary to exclude neutron-lib 1.15.0 and pickup 1.16.0 once we get it released. Feel free to reach out on #openstack-neutron if you have questions. Thanks [1] https://review.openstack.org/#/c/574068/ [2] https://review.openstack.org/#/c/573826/ [3] http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22from%20file%20runtime.py%2C%20line%2062%5C%22