chef - error deleting clients

gistfile1.txt

[csmith@opschef01 Fri Aug 26 08:48 PM] ~/.chef
$ knife client list
  chef-validator
  chef-webui
  chickenfry
  csmith
  csmith_opslog02
  i-978d81f6
  ops-chef-01
  root
[csmith@opschef01 Fri Aug 26 08:48 PM] ~/.chef
$ knife client delete i-978d81f6
Do you really want to delete i-978d81f6? (Y/N) y
ERROR: Server returned error for http://chef.spanning.co:4000/clients/i-978d81f6, retrying 1/5 in 3s
ERROR: The object you are looking for could not be found
Response: Cannot load client i-978d81f6
[csmith@opschef01 Fri Aug 26 08:48 PM] ~/.chef
$ knife client list
  chef-validator
  chef-webui
  chickenfry
  csmith
  csmith_opslog02
  ops-chef-01
  root

[csmith@opschef01 Fri Aug 26 08:48 PM] /var/log/chef
$ knife node list

[csmith@opschef01 Fri Aug 26 08:48 PM] /var/log/chef
$