Problem after updating to 3.6 wordpress

Dear Sakin good afternoon, I have a web site www.astypalaiacamping.gr and after updating to wordpress 3.6 i get this massage. "Notice: wpdb::escape is deprecated since version 3.6! Use wpdb::prepare() or esc_sql() instead. in /var/www/vhosts/astypalaiacamping.gr/httpdocs/wp-includes/functions.php on line 2871 Notice: wpdb::escape is deprecated since version 3.6! Use wpdb::prepare() or esc_sql() instead. in /var/www/vhosts/astypalaiacamping.gr/httpdocs/wp-includes/functions.php on line 2871 Notice: wpdb::escape is deprecated since version 3.6! Use wpdb::prepare() or esc_sql() instead. in /var/www/vhosts/astypalaiacamping.gr/httpdocs/wp-includes/functions.php on line 2871 Notice: wpdb::escape is deprecated since version 3.6! Use wpdb::prepare() or esc_sql() instead. in /var/www/vhosts/astypalaiacamping.gr/httpdocs/wp-includes/functions.php on line 2871 Notice: wpdb::escape is deprecated since version 3.6! Use wpdb::prepare() or esc_sql() instead. in /var/www/vhosts/astypalaiacamping.gr/httpdocs/wp-includes/functions.php on line 2871 Notice: wpdb::escape is deprecated since version 3.6! Use wpdb::prepare() or esc_sql() instead. in /var/www/vhosts/astypalaiacamping.gr/httpdocs/wp-includes/functions.php on line 2871 Notice: wpdb::escape is deprecated since version 3.6! Use wpdb::prepare() or esc_sql() instead. in /var/www/vhosts/astypalaiacamping.gr/httpdocs/wp-includes/functions.php on line 2871" Do you know how I can fix it ? is it a theme problem because I beactivated all the plugins and it doesn't desipear. Thank you in advance Armandos