eBay auth token expiration error code

GeteBayOfficialTimeResponse.xml

<GeteBayOfficialTimeResponse xmlns="urn:ebay:apis:eBLBaseComponents">
    <Timestamp>2018-04-09T07:40:32.535Z</Timestamp>
    <Ack>Failure</Ack>
    <Version>1047</Version>
    <Build>E1047_CORE_API_18645815_R1</Build>
    <Errors>
        <ShortMessage>This Token has been revoked by App.</ShortMessage>
        <LongMessage>This Token has been revoked by App. The end user must complete the Auth &amp; Auth consent flow again to generate a valid token.</LongMessage>
        <ErrorCode>21916013</ErrorCode>
        <SeverityCode>Error</SeverityCode>
        <ErrorClassification>RequestError</ErrorClassification>
    </Errors>
</GeteBayOfficialTimeResponse>