TYPO3 Core

I use the scheduler to automatically fetch RSS feeds with rss2import. I always get the following error messages in the backend log. System is Debian Etch, PHP 5.2.0.

[scheduler]: Task executed. Class: tx_rss2import_scheduler, UID: 3
Core: Error handler (BE): PHP Warning: Invalid argument supplied for foreach() in /var/www/web103/html/typo3_src-4.5.3/t3lib/class.t3lib_tcemain.php line 7130
Core: Error handler (BE): PHP Warning: array_reverse(): The argument should be an array in /var/www/web103/html/typo3_src-4.5.3/t3lib/class.t3lib_tcemain.php line 7128
Core: Error handler (BE): PHP Warning: Wrong parameter count for debug_backtrace() in /var/www/web103/html/typo3_src-4.5.3/t3lib/class.t3lib_tcemain.php line 7128
Core: Error handler (BE): PHP Warning: Invalid argument supplied for foreach() in /var/www/web103/html/typo3_src-4.5.3/t3lib/class.t3lib_tcemain.php line 7130
Core: Error handler (BE): PHP Warning: array_reverse(): The argument should be an array in /var/www/web103/html/typo3_src-4.5.3/t3lib/class.t3lib_tcemain.php line 7128
Core: Error handler (BE): PHP Warning: Wrong parameter count for debug_backtrace() in /var/www/web103/html/typo3_src-4.5.3/t3lib/class.t3lib_tcemain.php line 7128