function error() {
        if ($this->error) {
            //Put some template variables for debugging here ...
            $debug_tpl_vars = array(
                '{LANGUAGE}' => $this->language,
                '{PATH}' => $this->language_path
            );
            $msg = str_replace(
                array_keys($debug_tpl_vars),
                array_values($debug_tpl_vars),
                $this->error_messages[$this->error]);

            return "<br /><strong>GeSHi Error:</strong> $msg (code {$this->error})<br />";
        }
        return false;
    }