Depricated function

Notice: wp-includes/functions.php:4020 – has_cap was called with an argument that is deprecated since version 2.0.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead.
require(‘wp-admin/menu.php’), require_once(‘wp-admin/includes/menu.php’), do_action(‘admin_menu’), WP_Hook->do_action, WP_Hook->apply_filters, IP2LocationCountryBlocker->admin_page, add_options_page, add_submenu_page, current_user_can, WP_User->has_cap, _deprecated_argument, trigger_error