<OperationOutcome xmlns="http://hl7.org/fhir">
    <issue>
        <details>
            <text value="Error expanding ValueSet &quot;null: Error unmarshalling resource: The filter &quot;concept descendent-of 442083009&quot; was not understood in the context of http://snomed.info/sct" />
        </details>
    </issue>
</OperationOutcome>