Unable to serialize record error with SQL Processors

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I’m trying to create a SQL Processor that converts an XML topic (VBAK_VBAP_2) to a new topic.

SET defaults.topic.autocreate=true;

INSERT INTO VBAK_VBAP_JSON
STORE
KEY AS STRING
VALUE AS STRING
SELECT STREAM *
FROM VBAK_VBAP_2;

The processor is created but fails at launch with the error:

Unable to serialize record. ProducerRecord(topic=[VBAK_VBAP_JSON], partition=[null], timestamp=[1760360118511]