And, it failed working again :(
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="<{$xoops_langcode}>" lang="<{$xoops_langcode}>">
<head>
<{$xoops_module_header}>
<meta http-equiv="content-type" content="text/html; charset=<{$xoops_charset}>" />
<meta http-equiv="content-language" content="<{$xoops_langcode}>" />
<meta name="robots" content="<{$xoops_meta_robots}>" />