Flipkart Seller API "DEPENDENT_SYSTEM_CALL_FAILED" error

Question

We are working on flipkart integration and facing issue in few of API which is as below. Here we are trying to mark a shipment as "ready_to_dispatch" so that we can download the invoice and label.

API: https://api.flipkart.net/sellers/v3/shipments/dispatch

Request Body:

{
    "shipmentIds": [
        "actualShipmentId"
    ],
    "locationId": "acutalLocationId"
}

Response Body:

{
    "shipments": [
        {
            "shipmentId": "actualShipmentId",
            "status": "FAILURE",
            "errorCode": "DEPENDENT_SYSTEM_CALL_FAILED",
            "errorMessage": "A call to dependent system failed. Please retry after some time"
        }
    ]
}

Is there anyone who can suggest something on this?

Initially i thought it was due to that as a customer I didn't accepted the order from flipkart over call. But now after the confirming the order as well I'm not able to mark it. Is there anything which I'm missing.