Invalid Operation outcome

In this example, operation outcome resource is having an invalid error during the validation operation.

{
"resourceType": "OperationOutcome",
"id": "333b21f7-a92c-4ec5-987b-62c13e1dbde9",
"issue": [
{
"severity": "error",
"code": "invalid",
"diagnostics": "<Content invalid against the specification or a profile>"
}
]
}