warning message when i click on process feed

'm seen this warning message whenever i click on process feeds..below are the warning messages
Warning: Missing argument 2 for wpdb::prepare(), called in /home/safmaad/public_html/wp-content/plugins/autoblog/autoblogincludes/includes/functions.php on line 100 and defined in /home/safmaad/public_html/wp-includes/wp-db.php on line 990

Warning: Cannot modify header information - headers already sent by (output started at /home/safmaad/public_html/wp-includes/wp-db.php:990) in /home/safmaad/public_html/wp-includes/pluggable.php on line 876