Installation bitflux cms

Hallo,
nach der Installation habe ich auf meiner Webseite folgende 
Fehlermeldungen :

Warning: process() [function.process]: Error Undefined namespace prefix 
in 
/usr/local/httpd/bin/bitlib/php/popoon/components/transformers/xslt.php 
on line 57

Warning: process() [function.process]: xmlXPathCompiledEval: evaluation 
failed in 
/usr/local/httpd/bin/bitlib/php/popoon/components/transformers/xslt.php 
on line 57

Warning: session_start() [function.session-start]: Cannot send session 
cache limiter - headers already sent (output started at 
/usr/local/httpd/bin/bitlib/php/popoon/components/transformers/xslt.php:57) 
in 
/usr/local/httpd/bin/bitlib/php/popoon/components/matchers/phpglobals.php 
on line 55

Warning: Cannot modify header information - headers already sent by 
(output started at 
/usr/local/httpd/bin/bitlib/php/popoon/components/transformers/xslt.php:57) 
in /usr/local/httpd/bin/bitlib/php/popoon/sitemap/sitemap.php on line 205

Warning: Cannot modify header information - headers already sent by 
(output started at 
/usr/local/httpd/bin/bitlib/php/popoon/components/transformers/xslt.php:57) 
in /usr/local/httpd/bin/bitlib/php/popoon/sitemap/sitemap.php on line 205

Kein Problem bereitet der Administrationsbereich....

Kann mir jemand weiterhelfen ?
Jo

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