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magnum quickstart - error "expecting a flannel network_driver"

I am curious about containers and how they can be managed with Magnum. Very comprehensive quickstart instructions are available, but while the devstack installation completed successfully, I had a failure very early in the process:

$ magnum baymodel-create --name k8sbaymodel (... more options see quickstart ...)
ERROR: Cannot fulfill request with a None network_driver, expecting a flannel network_driver. (HTTP 400)

Not knowing much about containers and even less about Kubernetes, I don't know how to continue there. I guess it would work out of the box with a different version of devstack, but which one? Other ideas?

Thanks,

Bernd