E_PACK_DUPLICATE_SRC error

During update resource on ACS I got the error responce.

<error xmlns="http://ns.adobe.com/adept" data="E_PACK_DUPLICATE_SRC http://myACSurl/packaging/Package urn:uuid:bca93e2f-1eb0-4d6d-883a-d2d91c7e16dd http://myACSurl/media/bca93e2f-1eb0-4d6d-883a-d2d91c7e16dd.epub"/>

Packet which was sent to ACS (removed data and trumbnailData content)

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<package xmlns="http://ns.adobe.com/adept" action="replace">

    <data>Base-64 encoded data</data>

    <trumbnailData> Base-64 encoded data</trumbnailData>

    <resource>urn:uuid:bca93e2f-1eb0-4d6d-883a-d2d91c7e16dd</resource>

    <metadata xmlns:dc="http://purl.org/dc/elements/1.1/">

        <dc:format>application/epub+zip</dc:format>

    </metadata>

    <permissions>

        <display>

            <until>2020-01-13T13:10:49-07:00</until>

        </display>

        <excerpt>

             <until>2020-01-13T13:10:49-07:00</until>          

        </excerpt>

        <print>

             <count initial="10" max="20" incrementInterval="3600"/>

             <maxResolution>300</maxResolution>

        </print>

    </permissions>

    <expiration>2020-01-13T13:10:49-07:00</expiration>

    <nonce>MTI2MzkwMDA3MTQ1MjE1</nonce>

    <hmac>Base-64 encoded hmac</hmac>

</package>

Please let me know what's wrong in that packet.

Thanks.