Amazon S3 Source Connector returns "Unable to read S3 objects with the provided bucket and path."

Kafka Connect
1

Amazon S3 Source Connector returns "Unable to read S3 objects with the provided bucket and path., but I think there is no problem in my config.
Are there any problem in my config? It’s clear that I made the same bucket and folder in s3.

curl -X PUT -H  "Content-Type:application/json" \
http://localhost:8083/connectors/s3-connector/config -d '
{
  "connector.class": "io.confluent.connect.s3.source.S3SourceConnector",
  "tasks.max": 1,
  "mode": "GENERIC",
  "topic.regex.list": "topics:.*",
  "s3.bucket.name": "s3-connector",
  "topics.dir": "topics",
  "format.class": "io.confluent.connect.s3.format.avro.AvroFormat"
}
'
2

This was because I did add a specific s3.region in config. The default value was us-west-2, but I didn’t use it.

Amazon S3 Source Connector Configuration Properties | Confluent Documentation