Postgresql: ERROR: syntax error at or near "DO" - postgresql

Question

I am using the below query to perform upsert operation against posstgres db. But i get error "syntax error at or near do". I suppose it is do with line ON CONFLICT ((message_payload-->'jsonContent'->>'message_id'))
Here i am trying to check for identity based on json parameter key messageId. Can some one help me by mentioning the missing info i have.
INSERT INTO public.error_message(
id, created_by, created_dt, modified_by, modified_dt, attempt, message_headers, message_main_topic, message_payload, message_status, message_status_code)
VALUES (51, null, null, null, null, 1, '{
"jsonContent": {
"content-length": "1635",
"message_status_code": "417",
"cookie": "JSESSIONID=279AF4C174E6192BDAB11A067768BBD5",
"postman-token": "f0f33e86-498f-452a-aaf6-18eb84dc5907",
"kafka_timestampType": "CREATE_TIME",
"message_id": "21",
"kafka_receivedMessageKey": "null",
"kafka_receivedTopic": "error-topic",
"accept": "*/*",
"kafka_offset": "33",
"kafka_consumer": "org.apache.kafka.clients.consumer.KafkaConsumer#5091bb5f",
"host": "localhost:8082",
"content-type": "application/json",
"connection": "keep-alive",
"cache-control": "no-cache",
"kafka_receivedPartitionId": "0",
"kafka_receivedTimestamp": "1552305428711",
"accept-encoding": "gzip, deflate",
"message_main_topic": "ldarsQCustomStatistics.1",
"user-agent": "PostmanRuntime/7.6.1"
}
}', ‘abcd.1’, '{
"jsonContent": {
"messageTime": 16772223422,
"messageRev": 9,
"businessId": "DB",
"messageId": "55",
"deviceId": "DB_1234_SMM",
"assetType": "Locomotive",
"messageType": "thirdparty-timeseries",
"assetId": "DB_1234",
"appId": "ThirdPartyApp",
}
}', 1, 201)
ON CONFLICT ((message_payload-->'jsonContent'->>'message_id'))
DO UPDATE SET attempt=attempt+1