成都中冠月饼价格:asp代码错误

下面这段代码提示
Microsoft JET Database Engine (0x80040E07)
标准表达式中数据类型不匹配。
/save.asp, 第 29 行
29行是 conn.execute sql
大家帮我看看是哪不对了
表单的值都可以传递过来，数据库也能正常打开
表里的字段的值都没有限制

<%
Set Conn=Server.CreateObject("ADODB.Connection")
db="ycl.mdb"
connstr ="Provider = Microsoft.Jet.OLEDB.4.0; Data Source ="& Server.MapPath(db)
Conn.Open connstr

%>
<%
clienttype=request.form("clienttype")
comname=request.form("comname")
comaddr=request.form("comaddr")
postalcode=request.form("postalcode")
clientname=request.form("clientname")
tel=request.form("tel")
tel=request.form("tel")
fax=request.form("fax")
email=request.form("email")
item=request.form("item")
yaoqiu=request.form("yaoqiu")
comname=request.form("comname")
menu=request.form("menu")
referrence1=request.form("referrence1")
referrence2=request.form("referrence2")
referrence3=request.form("referrence3")
leaveword=request.form("leaveword")
ip=Request.ServerVariables("SERVER_NAME")
sql = "insert into orders(clienttype,comname,comaddr,postalcode,clientname,tel,fax,email,item,yaoqiu,menu,referrence1,referrence2,referrence3,leaveword,ip)values('"&clienttype&"','"&comname&"','"&comaddr&"','"&postalcode&"','"&clientname&"','"&tel&"','"&fax&"','"&email&"','"&item&"','"&yaoqiu&"','"&menu&"','"&referrence1&"','"&referrence2&"','"&referrence3&"','"&leaveword&"','"&ip&"')"
conn.execute sql
%>