Comment 1 for bug 1598773

It's not existing in my devstack env, there is my environment:

OS_REGION_NAME=RegionOne
OS_PROJECT_NAME=admin
OS_IDENTITY_API_VERSION=2.0
OS_PASSWORD=Galax8800
OS_AUTH_URL=http://192.168.1.105:5000/v2.0
OS_USERNAME=admin
OS_TENANT_NAME=admin
OS_VOLUME_API_VERSION=2
OS_NO_CACHE=1

Or you can give more information by using openstack --debug queue list.