都是浮云:Server 对象 错误 800401f3 Server.CreateObject 失败

我网站的会员系统不能注册了,,不知道怎么了.点注册添完数据之后就提示
Server 对象 错误 'ASP 0177 : 800401f3'

Server.CreateObject 失败

/sendmail.asp，行 18

800401f3
不知道是不是/sendmail.asp 18行缺少了什么语句!!!
这是sendmail.asp的源代码

<%
sub sendmail
mailfoot="------------------- "&citytitle&" -------------------" & vbcrlf &"本邮件为系统自动发送，请不要直接回复。"
mailserver=citymailsmtp
mailserverloginname=citymaillog
mailserverloginpass=citymailpass
mailuserdomain=citymaildns

'获取表单数据
fromname=cityname
frommail=citymaildns
toname=toname
tomail=tomail
mailtitle=mailtitle
mailbody=mailbody

dim JMail
Set JMail=Server.CreateObject("JMail.Server")
JMail.Silent=true
JMail.Charset = "gb2312"
JMail.FromName = fromname
JMail.from = frommail
JMail.AddRecipient tomail,toname
JMail.Subject = mailtitle
jmail.Body=mailbody & vbcrlf & vbcrlf & mailfoot

JMail.MailServerUserName = mailserverloginname
JMail.MailServerPassWord = mailserverloginpass
JMail.MailDomain = mailuserdomain
sendok=JMail.send(mailserver)

if sendok then
send_mail="ok"
else
send_mail="err"
end if

end sub%>