Hey Oliver, it seems that the error is caused by a node group ID not being found in the database. This could happen if the node group was deleted or never created in the first place. Here are some possible ways to fix this issue: • You can try to recreate the node group using the nova-manage nodegroup create command with the same name and UUID as the one you are trying to use. • if the node group exists in the database by using the nova-manage nodegroup list command and look for the one with the matching UUID. • verify that you have created a cluster template with a valid node group ID and that it matches the one you are trying to use.You can • check if there are any other processes or services that are using or locking the node group ID and terminate them. I hope this helps you resolve your problem, mate :) Cheers, Best, Kerem Çeliker Head of Cloud Architecture tr.linkedin.com/in/keremceliker