1010: Field type.
A field has the wrong JSON type, or is null where null is not accepted.
HTTP status: 400 or 422, depending on the request. May also be reported as a field-level finding in error.details[].
The value at param is the wrong JSON type for the field, or is null on a field the contract does not declare nullable. A top-level body field caught by the decoder answers 400; a field inside a part or a strict body answers 422 with the pointer in details.
Troubleshooting
Section titled “Troubleshooting”- Inspect error.param / details[].param and the message, which names the expected type.