hi, I downloaded the code from the master branch and installed Tacker manual by the document[1]. I met an error when I started the tacker-server by "python /usr/bin/tacker-server --config-file /etc/tacker/tacker.conf --log-file /var/log/tacker/tacker.log". The error message is " 2016-09-12 11:20:48.427 ERROR stevedore.extension [req-4799662d-a606-4337-802f-d94c44b35a50 None None] Could not load 'noop': Can't instantiate abstract class DeviceNoop with abstract methods get_resource_info 2016-09-12 11:20:48.428 ERROR stevedore.extension [req-4799662d-a606-4337-802f-d94c44b35a50 None None] Could not load 'nova': Can't instantiate abstract class DeviceNova with abstract methods get_resource_info " Did anyone meet the same error as me? Hope for your reply. Thanks [1]. http://docs.openstack.org/developer/tacker/install/manual_installation.html -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20160912/daaa1214/attachment.html>