Hi everyone,

My Azure Data Factory Mapping Data Flow in Japan East failed on October 28, 2026, with error code 145 ( System error ).

The error was:

Encountered the following exception when trying to create Remote Application Folder: System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.Marlin.Common.Storage.Impl.DataLakeServiceClientFactory.GetDataLakeServiceClient(String traceId, String storageAccountUri, String fileSystemName, String sasToken, Boolean skipCache) ... line 102 at Microsoft.Marlin.Common.ClusterStorage.ADLSGen2ClusterStorageWithUdk.GetADLSGen2FileSystemClient(...) at Microsoft.Marlin.Common.ClusterStorage.ADLSGen2ClusterStorageWithUdk.<>c__DisplayClass26_0.<CreateRemoteApplicationFolderAsync>b__3>d.MoveNext() ... line 503 ... at Polly.Retry.AsyncRetryEngine.ImplementationAsync[TResult](...) at Polly.AsyncPolicy.ExecuteAsync(...) at Microsoft.Marlin.Common.ClusterStorage.ADLSGen2ClusterStorageWithUdk.CreateRemoteApplicationFolderAsync(...) ...…