Required Operation outcome

In this example, operation outcome resource is having an required element missing error during the validation operation.

{
    "resourceType": "OperationOutcome",
    "id": "ff9c8f18-1025-4457-8237-b553011b71f7",
    "issue":  [
        {
            "severity": "error",
            "code": "required",
            "diagnostics": "<A required element is missing>"
        }
    ]
}