I'm had to reset the file & folder permissions on my server after a server move, and now iJoomla RSS is crashing with:

Warning: chmod() [function.chmod]: Operation not permitted in /var/www/vhosts/<domain>/httpdocs/components/com_ijoomla_rss/ijoomla_rss.php on line 1439

Warning: fopen(/var/www/vhosts/<domain>/httpdocs//components/com_ijoomla_rss/xmlfiles/full_content.xml) [function.fopen]: failed to open stream: Permission denied in /var/www/vhosts/<domain>/httpdocs/includes/feedcreator.class.php on line 711

Error creating feed file, please check write permissions.

Since ijoomla_rss.php is encrypted, can you tell me what permissions I need to change to fix this..?