excersises/aggregates.sh fails with multi host setup

Running exercises/aggregates.sh fails with multi-host setup:

stack@DevStackOSDomU:~$ cd devstack/
stack@DevStackOSDomU:~/devstack$ . openrc admin
stack@DevStackOSDomU:~/devstack$ nova aggregate-list

stack@DevStackOSDomU:~/devstack$ nova host-list | grep compute
| DevStackComputeSlave | compute |
| DevStackOSDomU | compute |

stack@DevStackOSDomU:~/devstack$ exercises/aggregates.sh 2>&1 | tail -16
++ read data
+ HOST='DevStackComputeSlave
DevStackOSDomU'
+ nova aggregate-add-host 9 DevStackComputeSlave DevStackOSDomU
usage: nova [--version] [--debug] [--no-cache] [--timings]
            [--os-username <auth-user-name>] [--os-password <auth-password>]
            [--os-tenant-name <auth-tenant-name>] [--os-auth-url <auth-url>]
            [--os-region-name <region-name>] [--os-auth-system <auth-system>]
            [--service-type <service-type>] [--service-name <service-name>]
            [--volume-service-name <volume-service-name>]
            [--endpoint-type <endpoint-type>]
            [--os-compute-api-version <compute-api-ver>] [--insecure]
            [--bypass-url <bypass-url>]
            <subcommand> ...
error: unrecognized arguments: DevStackOSDomU
Try 'nova help ' for more information.