greenmoon on "Cannot access my wp-admin panel (Error 500)"

I just went to the error log and retrieved this:

PHP Fatal error: Call to undefined method dbrc_wpdb::delete() in /home1/wiscont2/public_html/stampcollectinginformation/wp-includes/option.php on line 370

line 370 of option.php reads

$result = $wpdb->delete( $wpdb->options, array( 'option_name' => $option ) );