Device Busy Error while fetching number plate information using ISAPI Hikvision

Question

I am unable to fetch the number plate info from hikvision video center. I want to access it using the API.

I am getting the response as shown below while fetching the number plate info of vehicle from ANPR Hik vision network video center.

<ResponseStatus xmlns="http://www.isapi.org/ver20/XMLSchema" version="2.0">
<requestURL>/ISAPI/Traffic/channels/1/vehicleDetect/plates</requestURL>
<statusCode>2</statusCode>
<statusString>Device Busy</statusString>
<subStatusCode>serviceUnavailable</subStatusCode>
</ResponseStatus>

I want the response as shown below.

<Plates version="2.0">
    <Plate>
    <captureTime>20340109T094130+0400</captureTime>
    <plateNumber>A 39837</plateNumber>
    <picName>203401090941300600</picName>
    <country>NON</country>
    <laneNo>1</laneNo>
    <direction>reverse</direction>
    <matchingResult>otherlist</matchingResult>
    </Plate>
</Plates>