Not able to configure zone

Hi Team,

I am having three non-global zone from one zone is running and two are in configured state:-

root@db-c # zoneadm list -cv

  ID NAME STATUS     PATH                           BRAND    IP

   0 global running    /                              native   shared

   1 db running    /zone/db                       native   shared

   - dpa configured /zone/dpa                      native   shared

   - dpb configured /zone/dpb                      native   shared

root@db-c # zoneadm -z dpa install

Cannot install detached zone.

Use attach or remove /zone/dpa directory.

could not verify zonepath /zone/dpa because of the above errors.

zoneadm: zone dpa failed to verify

zonecfg:dpa> info

zonename: dpa

zonepath: /zone/dpa

brand: native

autoboot: true