sdk分块copy的例子报错

                        UploadPartCopyRequest uploadPartCopyRequest = new UploadPartCopyRequest(sourceBucketName, sourceKey,
                targetBucketName, targetKey);
            uploadPartCopyRequest.setBucketName(targetBucketName);
            uploadPartCopyRequest.setKey(targetKey);
            uploadPartCopyRequest.setUploadId(uploadId);
            uploadPartCopyRequest.setPartSize(size);
            uploadPartCopyRequest.setBeginIndex(skipBytes);
            uploadPartCopyRequest.setPartNumber(i + 1);
            
            UploadPartCopyResult uploadPartCopyResult = client.uploadPartCopy(uploadPartCopyRequest);