# Troubleshooting bulk import and export operations
<a name="troubleshooting-bulk"></a>

To handle and diagnose errors produced during a transfer job, see the Amazon IoT TwinMaker **GetMetadataTransferJob** API:

1. After creating and running a transfer job, call the **GetMetadataTransferJob** API:

   ```
   aws iottwinmaker get-metadata-transfer-job \ 
   --metadata-transfer-job-id your_metadata_transfer_job_id \ 
   --region us-east-1
   ```

1.  The state of the job changes to one of the below states:
   + COMPLETED
   + CANCELLED
   + ERROR

1.  The **GetMetadataTransferJob** API returns a [ MetadataTransferJobProgress](https://docs.amazonaws.cn/iot-twinmaker/latest/apireference/API_MetadataTransferJobProgress.html) object. 

1. The **MetadataTransferJobProgress** object contains the following parameters:
   + **failedCount** : Indicates the count of assets that failed during the transfer process.
   + **skippedCount** : Indicates the count of assets that were skipped during the transfer process.
   + **succeededCount** : Indicates the count of assets that succeeded during the transfer process.
   + **totalCount** : Indicates the total count of assets involved in the transfer process.

1. Additionally a **reportUrl** element is returned by the API call, which contains a pre-signed URL. If your transfer job has errors that needs investigation, you can download a full error report at this URL.