Bursting to FTP/SFTP is erroring out

Hi All,

<?xml version="1.0" encoding="UTF-8"?>

<xapi:requestset xmlns:xapi="http://xmlns.oracle.com/oxp/xapi">

  <xapi:request select="/DATA/G_DATA">

    <xapi:delivery>

      <xapi:ftp id="sftp_delivery" server="ddd.aaa.bbb.ccc.com" port="22" user="xxxxuser" password="jgfgeghhgsz" remote-directory="/tmp" remote-file="${NUMBER}_${ID}.pdf" secure-ftp="TRUE"/>

    </xapi:delivery>

    <xapi:document output="${NUMBER}_${ID}.pdf" output-type="pdf" delivery="sftp_delivery">

      <xapi:template type="rtf" location="/tmp/XX_TEMPLATE.rtf" filter="/DATA/G_DATA [(TYPE='xxx') and ID='444']" />

     </xapi:document>

  </xapi:request>

</xapi:requestset>

I'm using above bursting control file and ending up with below error : "SshException: Error in writing data Broken pipe (Write failed)"