集思录可转债:错误的参数个数或无效的参数属性值: 'Bytestobstr'

我在调试这段程序时出现这个错误

该行代码提示错误 ,这段是网上发布的小偷程序,谁能告诉我一下是什么原因
getHTTPPage=Bytestobstr(Http.responseBody,"Gb2312")

<%
'常用函数
'1、输入url目标网页地址，返回值getHTTPPage是目标网页的html代码
function getHTTPPage(url)
dim Http
set Http=server.createobject("MSXML2.XMLHTTP")
Http.open "GET",url,false
Http.send()
if Http.readystate<>4 then
exit function
end if
getHTTPPage=Bytestobstr(Http.responseBody,"Gb2312")
set http=nothing
if err.number<>0 then err.Clear
end function
Function BytesToBstr(body)
dim objstream
set objstream = Server.CreateObject("adodb.stream")
objstream.Type = 1
objstream.Mode =3
objstream.Open
objstream.Write body
objstream.Position = 0
objstream.Type = 2
objstream.Charset = "GB2312" '转换原来默认的UTF-8编码转换成GB2312编码，否则直接用XMLHTTP组件调用有中文字符的网页得到的将是乱码
BytesToBstr = objstream.ReadText
objstream.Close
set objstream = nothing
End Function
'下面试着调用http://www.3doing.com/earticle/的html内容
Dim Url,Html
Url="http://127.0.0.1/"
Html = getHTTPPage(Url)
Response.write Html
%>