When I try to register a new business, I receive this error below

Fatal error: Class 'WP_Filesystem' not found in /home2/jillian/public_html/wp-content/plugins/blogtemplates/blogtemplatesfiles/copier.php on line 342

Warning: Missing argument 2 for wpdb::prepare(), called in /home2/jillian/public_html/wp-content/plugins/limit-blogs-per-user/limit-bogs-per-user.php on line 112 and defined in /home2/jillian/public_html/wp-includes/wp-db.php on line 992

Warning: Missing argument 2 for wpdb::prepare(), called in /home2/jillian/public_html/wp-content/plugins/limit-blogs-per-user/limit-bogs-per-user.php on line 112 and defined in /home2/jillian/public_html/wp-includes/wp-db.php on line 992

Warning: Missing argument 2 for wpdb::prepare(), called in /home2/jillian/public_html/wp-content/plugins/limit-blogs-per-user/limit-bogs-per-user.php on line 112 and defined in /home2/jillian/public_html/wp-includes/wp-db.php on line 992

Warning: Missing argument 2 for wpdb::prepare(), called in /home2/jillian/public_html/wp-content/plugins/limit-blogs-per-user/limit-bogs-per-user.php on line 112 and defined in /home2/jillian/public_html/wp-includes/wp-db.php on line 992

Please help