openvas-scapdata-sync Error

[root@sys1 openvas]# openvas-scapdata-sync
[i] This script synchronizes a SCAP data directory with the OpenVAS one.
[i] SCAP dir: /var/lib/openvas/scap-data
[i] Will use rsync
[i] Using rsync: /usr/bin/rsync
[i] Configured SCAP data rsync feed: rsync://feed.openvas.org:/scap-data
OpenVAS feed server - http://www.openvas.org/
This service is hosted by Intevation GmbH - http://intevation.de/
All transactions are logged.

Please report synchronization problems to openvas-feed@intevation.de.
If you have any other questions, please use the OpenVAS mailing lists
or the OpenVAS IRC chat. See http://www.openvas.org/ for details.

receiving incremental file list

sent 68 bytes  received 1564 bytes  652.80 bytes/sec
total size is 654227093  speedup is 400874.44
[i] Updating CPEs
/usr/sbin/openvas-scapdata-sync: line 839: 24708 Killed                  xsltproc --stringparam refdate $CVE_REFDATE $SCAP_RES_DIR/cpe_youngerthan.xsl -
-:1: parser error : Document is empty

^
-:1: parser error : Start tag expected, '<' not found

^
unable to parse -
[e] Update of CPEs failed: xsltproc exited with code 137