When i activate these I get :
Warning: main(/home/cyer/public_html/wp-includes/rss.php) [function.main]: failed to open stream: No such file or directory in /home/cyber/public_html/wp-content/plugins/wp-rssaggregator/wp-rssaggregator.php on line 10

Warning: main() [function.include]: Failed opening '/home/cyer/public_html/wp-includes/rss.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/cyber/public_html/wp-content/plugins/wp-rssaggregator/wp-rssaggregator.php on line 10

Warning: Cannot modify header information - headers already sent by (output started at /home/cyer/public_html/wp-content/plugins/wp-rssaggregator/wp-rssaggregator.php:10) in /home/cybergol/public_html/wp-includes/pluggable-functions.php on line 272


Is there maybe permission to be changed ?