Trying to upload file in s3 bucket using putObject

[SwethaMano3110]

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

[ImanHz]

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

[shinriyo]

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