Hi Alex Looks like the following errors are being emitted from Nova via Heat. Would you mind ensuring that you are able to spin up servers using nova CLI and then creating a simple heat stack via heat CLI. Cheers Bharat > On 21 Jul 2020, at 13:53, Alexander Dibbo - UKRI STFC <alexander.dibbo at stfc.ac.uk> wrote: > > Jul 17 14:08:24 host-172-16-103-43 magnum-conductor: 2020-07-17 14:08:24.942 6251 ERROR oslo_messaging.rpc.server InvalidParameterValue: ERROR: UnsupportedVersion: : resources.worker_nodes_server_group: : Invalid format of client version ''. Expected format 'X.Y', where X is a major part and Y is a minor part of version. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-discuss/attachments/20200722/f01dd989/attachment.html>