NetApp: Deleting Busy Snapshots

In vSphere 5.1, we created a backup of a VM using NetApp VSC (storage backup). It appears that NetApp took a snapshot of it -- smvi_Bkup_novmsnap_20131205130001 -- see below.

i1whlnetapp02> snap list Napp02_vol2
Volume Napp02_vol2
working...

  %/used       %/total  date          name
----------  ----------  ------------  --------
  5% ( 5%)    4% ( 4%)  Dec 06 08:00  hourly.0
  5% ( 0%)    4% ( 0%)  Dec 06 00:00  nightly.0
 10% ( 6%)    8% ( 4%)  Dec 05 20:00  hourly.1
 11% ( 0%)    8% ( 0%)  Dec 05 15:05  i1lvnetapp01(1883808135)_i1lvnapp02_vol2.3829 (busy,snapmirror)
 26% (18%)   23% (15%)  Dec 05 13:00  smvi_Bkup_novmsnap_20131205130001 (busy)
 26% ( 0%)   23% ( 0%)  Dec 05 12:05  i1lvnetapp01(1883808135)_i1lvnapp02_vol2.3828 (busy,snapmirror)
 26% ( 1%)   23% ( 1%)  Dec 05 00:00  nightly.1

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We then deleted the VM.

We are now trying to delete the backup we took using NetApp VSC plugin, but we are getting this error message:

Failed to delete backup. Reason: Snapshot 'smvi_Bkup_novmsnap_20131205130001' was not deleted as it is currenlty being used by application(s) 'busy'. Please retry after sometime.

The backup was created 22 hours ago.