ruby on rails - Act as paranoid is not recovering records -

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I was trying to recover the object from my admin mode and it is not working 

 Select  Admin.only_deleted.first.recovery Admin Load (1.9 mms) "Admin". * "Admin" order by WHERE ("admins" is not "deleted_at") "Admin". "ID" ASC Limit 1 NodeEp: # & Lt; Administrator: 0xa57f10c & gt; `Recover 'the undefined method for'   
 Any ideas?   
 
 
 is expected to recover, but this is not a true record which is a real pain

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