cannot add email alas using api

cannot add email alas using api

Hi:

   I performed a request to add an email alias for an existing account with the following details

     Verb PUT
     Request Data: 
     {
           "mode" : "addEmailAlias",
           "emailAliases" : "daniela"
     }
     I replaced zoid and account values with my organization and accounts ids.

     The api returned the following response

     

     {"data":{"errorCode":"EXTRA_KEY_FOUND_IN_JSON"},"status":{"code":404,"description":"Invalid Input"}}

      How should be formed a valid request?