Invalid hostname when creating a zone cluster

I have established a global cluster with two Solaris S7 nodes and a separate third-site quorum server.  All is operational at the global cluster level.

However, I am now attempting to create a zone cluster on top of this using the clsetup command.  When i get to the part about setting a host name for the zone cluster nodes, it gives me an error about an invalid host name:

>>> Zone Node for the Zone cluster(vutora01) Configuration(3) <<<    Select the zone-cluster node property that you want to change          Property Name               Current Setting          =============               ===============        1) physical-host              DUPUNX01        2) hostname        3) net:physical               aggr0        a) Add Another Network