我收到错误 “警告：无法修改标题信息 - 已在/home/happen/public_html/123.com/include/fg_membersite_1.php中发送的标题（由/home/happen/public_html/123.com/index.php:1开始输出）在第113行“
<?php
require_once("./include/membersite_config_1.php");
if(isset($_POST['submitted']))
{if($fgmembersite1->RegisterUser())
{$fgmembersite1->RedirectToURL("thank-you-uploaded.html");}}
?>
<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
我该如何解决这个问题？我尝试了很多东西.....没有效果.....请尽力帮助......