HelloSign unknown_error

Unknown Error

{
   "event":{
      "event_type":"unknown_error",
      "event_time":"1512659345",
      "event_hash":"44ce26e05fc01a12e0deac29d83d4d10328ef918b192fe96c763f0ab3770e345",
      "event_metadata":{
         "related_signature_id":null,
         "reported_for_account_id":"bc1225d28a648231a589100c07c9f17c82d80411",
         "reported_for_app_id":null
      }
   },
   "account_guid":"bc1225d28a648231a589100c07c9f17c82d80411",
   "client_id":null,
   "signature_request":{
      "signature_request_id":"2d31efa417aefd88e1eaecb416ea81294fcd6d585",
      "test_mode":true,
      "title":"using postman",
      "original_title":"using postman",
      "subject":"using postman",
      "message":"Three Signers multiple pages",
      "metadata":{

      },
      "is_complete":false,
      "is_declined":false,
      "has_error":true,
      "custom_fields":[

      ],
      "response_data":[

      ],
      "signing_url":null,
      "signing_redirect_url":null,
      "files_url":"https:\/\/api.hellosign.com\/v3\/signature_request\/files\/2d31efa417aefd88e1eaecb416ea81294fcd6d585",
      "details_url":"https:\/\/app.hellosign.com\/home\/manage?guid=2d31efa417aefd88e1eaecb416ea81294fcd6d585",
      "requester_email_address":"alex@hellosign.com",
      "signatures":[
         {
            "signature_id":"7a9c9eafeeda6cd5ac300fe57e32e735",
            "has_pin":false,
            "signer_email_address":"testing+unknownerror@hellosign.com",
            "signer_name":"Mr Postman",
            "order":null,
            "status_code":"error_unknown",
            "signed_at":null,
            "last_viewed_at":null,
            "last_reminded_at":null,
            "error":""
         }
      ],
      "cc_email_addresses":[

      ]
   }
}