8000 Trying to upload file in s3 bucket using putObject · Issue #43 · xtyxtyx/minio-dart · GitHub
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Trying to upload file in s3 bucket using putObject#43

Description

@SwethaMano3110
SwethaMano3110
opened on May 6, 2022

Am trying to upload document in aws s3 bucket using putObject await minio.putObject(bucketname,"path",data,
onProgress: (bytes){
print('uploaded');
}
);

But getting the error below, anyone can help me with it

Error: Unexpected null value.
at Object.throw_ [as throw] (http://localhost:53529/dart_sdk.js:5067:11)
at Object.nullCheck (http://localhost:53529/dart_sdk.js:5394:30)
at minio_client.MinioClient.new.getRequestUrl (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:1056:44)
at minio_client.MinioClient.new.getBaseRequest (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:1044:22)
at minio_client.MinioClient.new._request (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:999:28)
at _request.next ()
at runBody (http://localhost:53529/dart_sdk.js:40590:34)
at Object._async [as async] (http://localhost:53529/dart_sdk.js:40621:7)
at minio_client.MinioClient.new.[_request] (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:994:20)
at minio_client.MinioClient.new.request (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:1022:43)
at request.next ()
at runBody (http://localhost:53529/dart_sdk.js:40590:34)
at Object._async [as async] (http://localhost:53529/dart_sdk.js:40621:7)
at minio_client.MinioClient.new.request (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:1021:20)
at minio$.Minio.new.getBucketRegion (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:2233:41)
at getBucketRegion.next ()
at runBody (http://localhost:53529/dart_sdk.js:40590:34)
at Object._async [as async] (http://localhost:53529/dart_sdk.js:40621:7)
at minio$.Minio.new.getBucketRegion (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:2225:20)
at minio_client.MinioClient.new._request (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:996:55)
at _request.next ()
at runBody (http://localhost:53529/dart_sdk.js:40590:34)
at Object._async [as async] (http://localhost:53529/dart_sdk.js:40621:7)
at minio_client.MinioClient.new.[_request] (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:994:20)
at minio_client.MinioClient.new.request (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:1022:43)
at request.next ()
at runBody (http://localhost:53529/dart_sdk.js:40590:34)
at Object._async [as async] (http://localhost:53529/dart_sdk.js:40621:7)
at minio_client.MinioClient.new.request (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:1021:20)
at minio_uploader.MinioUploader.new._uploadChunk (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:293:39)
at _uploadChunk.next ()
at runBody (http://localhost:53529/dart_sdk.js:40590:34)
at Object._async [as async] (http://localhost:53529/dart_sdk.js:40621:7)
at minio_uploader.MinioUploader.new.[_uploadChunk] (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:292:20)
at minio_uploader.MinioUploader.new.addStream (http://localhost:53529/packages/minio/src/minio_uploader.dart.lib.js:246:56)
at addStream.next ()
at http://localhost:53529/dart_sdk.js:40571:33
at _RootZone.runUnary (http://localhost:53529/dart_sdk.js:40441:59)
at _FutureListener.thenAwait.handleValue (http://localhost:53529/dart_sdk.js:35363:29)
at handleValueCallback (http://localhost:53529/dart_sdk.js:35931:49)
at Function._propagateToListeners (http://localhost:53529/dart_sdk.js:35969:17)
at _Future.new.[_complete] (http://localhost:53529/dart_sdk.js:35809:25)
at _StreamIterator.new.[_onData] (http://localhost:53529/dart_sdk.js:37895:34)
at _RootZone.runUnaryGuarded (http://localhost:53529/dart_sdk.js:40378:11)
at _ControllerSubscription.new.[_sendData] (http://localhost:53529/dart_sdk.js:33906:22)
at _DelayedData.new.perform (http://localhost:53529/dart_sdk.js:37377:28)
at _StreamImplEvents.new.handleNext (http://localhost:53529/dart_sdk.js:37487:15)
at async._AsyncCallbackEntry.new.callback (http://localhost:53529/dart_sdk.js:37235:16)
at Object._microtaskLoop (http://localhost:53529/dart_sdk.js:40708:13)
at _startMicrotaskLoop (http://localhost:53529/dart_sdk.js:40714:13)
at http://localhost:53529/dart_sdk.js:36191:9

Activity

  1. ImanHz commented on Jun 16, 2022

    @ImanHz
    ImanHz
    on Jun 16, 2022

    possibly you have not specified the region or some other parameters in the minio initializations.

  2. shinriyo commented on Apr 27, 2023

    @shinriyo
    shinriyo
    on Apr 27, 2023
    Contributor

    This package has many wired things.
    If the author makes me a colaborator, It will be fine.

  3. arrrrny commented on Oct 22, 2026

    @arrrrny
    arrrrny
    on Oct 22, 2026

    The "Unexpected null value" was a null check in getRequestUrl that read the
    configured region without checking it. Fixed in the fork: the effective region
    falls back to us-east-1, and it decides the AWS host and the signing scope
    at the same time, so the two can no longer disagree.

  4. arrrrny commented on Oct 22, 2026

    @arrrrny
    arrrrny
    on Oct 22, 2026

    This ships in zuraffa_minio — the maintained fork of this package, which upstream has not touched since August 2025.

    The fork keeps the API of the original package unchanged, so moving over is an import swap:

    // before
import 'package:minio/minio.dart';
// after
import 'package:zuraffa_minio/minio.dart';

    Source, the changelog and the sweep of the open issues of this tracker: https://github.com/arrrrny/zuraffa_minio

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