Problem with attribute link

Agents, Protocols and APIs
1

Hi all,
im having a problem linking an attribute with other. The attribute with the link is:

{
  "bat": 4.14,
  "pres": 0,
  "coord": [
    -71.30850219726562,
    -41.13875961303711
  ]
}

The attribute to link is a number array of one dimension. The link is:

[
  {
    "ref": {
      "id": "5dzAUOP8rzODM3eoe11VHJ",
      "name": "coordenadas"
    },
    "filters": [
      {
        "type": "jsonPath",
        "path": "$.coord[:]",
        "returnFirst": true,
        "returnLast": false
      }
    ]
  }
]

The log throws an exception on the attribute link, any help? Thanks