def METHOD_NAME():
    client = boto3.client("rds", region_name="us-west-2")
    with pytest.raises(ClientError) as ex:
        client.cancel_export_task(ExportTaskIdentifier="export-snapshot-1")
    err = ex.value.response["Error"]
    assert err["Code"] == "ExportTaskNotFoundFault"
    assert err["Message"] == (
        "Cannot cancel export task because a task with the identifier "
        "export-snapshot-1 is not exist."
    )