DOMDocument::loadXML() errors

[freakshowtm]

i'm having problems with orca 1.2..
i have all the required php extensions enabled and still i get this error messages..
orca is displayed but i have this error messages at the top..

also i have suphp enabled..
i think it is the one that is causing this errors..

any thoughts?..

here's the link to the site..

http://www.myhotvette.com/orca

Warning: DOMDocument::loadXML() [function.DOMDocument-loadXML]: Empty string supplied as input in /home/myhotvet/public_html/orca/classes/Forum.php on line 1724

Warning: DOMDocument::loadXML() [function.DOMDocument-loadXML]: Empty string supplied as input in /home/myhotvet/public_html/orca/classes/Forum.php on line 1590

Warning: DOMDocument::loadXML() [function.DOMDocument-loadXML]: Empty string supplied as input in /home/myhotvet/public_html/orca/classes/Forum.php on line 1724

Warning: DOMDocument::loadXML() [function.DOMDocument-loadXML]: Empty string supplied as input in /home/myhotvet/public_html/orca/classes/Forum.php on line 1724

Warning: DOMDocument::loadXML() [function.DOMDocument-loadXML]: Empty string supplied as input in /home/myhotvet/public_html/orca/classes/Forum.php on line 1590

Warning: Cannot modify header information - headers already sent by (output started at /home/myhotvet/public_html/orca/classes/Forum.php:1724) in /home/myhotvet/public_html/orca/inc/util.inc.php on line 38

Warning: Cannot modify header information - headers already sent by (output started at /home/myhotvet/public_html/orca/classes/Forum.php:1724) in /home/myhotvet/public_html/orca/inc/util.inc.php on line 39

Warning: Cannot modify header information - headers already sent by (output started at /home/myhotvet/public_html/orca/classes/Forum.php:1724) in /home/myhotvet/public_html/orca/inc/util.inc.php on line 40

Warning: Cannot modify header information - headers already sent by (output started at /home/myhotvet/public_html/orca/classes/Forum.php:1724) in /home/myhotvet/public_html/orca/inc/util.inc.php on line 41

Warning: Cannot modify header information - headers already sent by (output started at /home/myhotvet/public_html/orca/classes/Forum.php:1724) in /home/myhotvet/public_html/orca/classes/BxXslTransform.php on line 63

[freakshowtm]

i also have this in my error logs in orca..

PHP Warning: Module 'xsl' already loaded in Unknown on line 0

what does this mean?..

i have no idea..

can anyone help me?..