This error code will be returned, for example, if you provide an invalid unit value when specifying the weight of shipment_contents:

  {
  "contents": [
    {
      "weight": {
        "value": 2.33,
        "unit": "cm"
      },
      //other properties
    }
  ]
}

The valid values for unit when specifying weight include:

  • kg - kilograms
  • lb - pounds