该错误通常是由于在 S3 路径中指定的“bucket”或“key”存在错误或未设置所导致的。将正确的 S3 bucket 和 key 传递给输出操作符即可解决此问题。以下是示例代码：

import org.apache.flink.streaming.api.functions.sink.filesystem.StreamingFileSink;
import org.apache.flink.streaming.api.functions.sink.filesystem.bucketassigners.BasePathBucketAssigner;
import org.apache.flink.streaming.api.functions.sink.filesystem.bucketassigners.DateTimeBucketAssigner;
import org.apache.flink.streaming.api.functions.sink.filesystem.bucketassigners.SimpleVersionedStringSerializer;
import org.apache.flink.streaming.api.functions.sink.filesystem.rollingpolicies.DefaultRollingPolicy;
import org.apache.flink.streaming.api.functions.sink.filesystem.rollingpolicies.OnCheckpointRollingPolicy;

StreamingFileSink s3Sink = StreamingFileSink
    .forBulkFormat(new Path(s3OutputPath), ParquetAvroWriters.forReflectRecord(MyRecord.class))
    .withBucketAssigner(new DateTimeBucketAssigner(s3OutputPath + "/${yyyy-MM-dd}/", "UTC"))
    .withBucketCheckInterval(1 * 60 * 1000L)
    .withRollingPolicy(
        DefaultRollingPolicy.builder()
            .withMaxPartSize(256 * 1024 * 1024)
            .withRolloverInterval(60 * 60 * 1000L)
            .withInactivityInterval(10 * 60 * 1000L)
            .build())
    .withOutputFileConfig(OutputFileConfig
        .builder()
        .withPartPrefix("data")
        .withPartSuffix(".snappy.parquet")
        .build())
    .build();

stream.addSink(s3Sink)
    .setParallelism(1)
    .name("s3Sink");

在上面的示例代码中，正确的 S3 bucket 和 key 已经传递给了 BucketAssigner：“DateTimeBucketAssigner(s3OutputPath + "/${yyyy-MM-dd}/", "UTC")”。如果您的代码中的路径有误，请检查并更正。