Confluent oracle cdc connector doesn't work

I installed Confluent’s oracle cdc connector, configured database (Oracle 19c no-cdb) to activate logminer.
the connector got the snapshotting very well.
However when it is done from snapshotting, after certain time, an error occured.

below the configuration of the connector(used versions: 2.2.0 → 2.6.0).

name=oracle

tasks.max=1

connector.class=io.confluent.connect.oracle.cdc.OracleCdcSourceConnector

redo.log.consumer.bootstrap.servers=kafka.broker.local

confluent.topic.bootstrap.servers=kafka.broker.local

key.converter=io.confluent.connect.avro.AvroConverter

key.converter.schema.registry.url=http://schema-registry:8081

value.converter=io.confluent.connect.avro.AvroConverter

value.converter.schema.registry.url=http://schema-registry:8081

oracle.server=oracle.local

oracle.port=1521

oracle.sid=db

oracle.username=confluentminer

oracle.password=dbz

redo.log.topic.name=redo-log

table.inclusion.regex=db.schema.table

lob.topic.name.template=db.schema.table.xmlcolumn

start.from=snapshot

confluent.topic.replication.factor=1

topic.creation.groups=redo

topic.creation.redo.replication.factor=1

topic.creation.redo.partitions=1

topic.creation.redo.cleanup.policy=delete

topic.creation.redo.retention.ms=1209600000

topic.creation.default.replication.factor=1

topic.creation.default.partitions=1

topic.creation.default.cleanup.policy=delete

enable.large.lob.object.support=true

errors.tolerance=all

errors.deadletterqueue.topic.name=my_dlq

redo.log.corruption.topic=corruption-topic

heartbeat.interval.ms=500

heartbeat.topic.name=heartbeat-topic