Can't locate object method "new" via package "XML::LibXML::SAX"

Hello,

I'm getting this error when I try to launch agent 2.1.1 on AIX6.1 TL9 SP1, same agent work fine on older AIX release:

[debug] Ocsinventory unified agent for UNIX, Linux and MacOSX 2.1.1
[debug] Log system initialised (Stderr)
[debug] --scan-homedirs missing. Don't scan user directories
[debug] ocsinv.conf updated successfully
[debug] Accountinfo file: /var/lib/ocsinventory-agent/http:__ocsi.entreprise.gie.local_ocsinventory/ocsinv.adm
[debug] OCS Agent initialised
[debug] No modules will be used.
[debug] Compress::Zlib is not available! The data will be compressed with
        gzip instead but won't be accepted by server prior 1.02
[debug] sending XML
[debug] sending: <?xml version="1.0" encoding="UTF-8"?>
<REQUEST>
  <QUERY>PROLOG</QUERY>
  <DEVICEID>XXXXXX-2016-12-13-16-30-35</DEVICEID>
</REQUEST>
[debug] =BEGIN=SERVER RET======
[debug] $VAR1 = '<?xml version=\'1.0\' encoding=\'UTF-8\'?>
<REPLY>
  <OPTION>
    <NAME>DOWNLOAD</NAME>
    <PARAM FRAG_LATENCY="10" PERIOD_LATENCY="1" ON="0" TYPE="CONF" CYCLE_LATENCY="60" TIMEOUT="30" PERIOD_LENGTH="10" EXECUTION_TIMEOUT="120" />
  </OPTION>
  <RESPONSE>SEND</RESPONSE>
  <PROLOG_FREQ>24</PROLOG_FREQ>
</REPLY>
';
[debug] =END=SERVER RET======
Can't locate object method "new" via package "XML::LibXML::SAX" at /usr/opt/perl5/lib/site_perl/5.8.8/XML/SAX/ParserFactory.pm line 43.

Any idea ?