OptionalField keys must be numeric

Error Description

The key field (key) in the Optional Field must contain be a numeric value between 1 and 10.

Example

{
  "err": [
      {
        "code": -2000,
        "msg": "OptionalField keys must be numeric."
      }
  ]
}

How to Resolve

Ensure that the key field (key) has been added in the Optional Field (opt) and is a number between 1 and 10.

For more information, see Optional Fields and Commit Request.