ADO Recordset Save as XML error

[Kasp]

When I try and save out a recordset from an ASP page as XML I get the
following error (the code is below) - I have ADO 2.8 installed and this
is running on win XP sp2 :

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ADODB.Recordset error '800a0bb9'

Arguments are of the wrong type, are out of acceptable range, or are in
conflict with one another.

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Const adOpenStatic = 3
Const adLockReadOnly = 1
Const adCmdText = 1
Const adPersistXML = 1

Dim rS
Dim conn
Dim sql
Dim xmlDoc

Set rS = Server.CreateObject ("ADODB.Recordset")
Response.ContentType = "text/xml"

Set conn = Server.CreateObject("ADODB.Connection")
conn.Open "DSN=Test;UID=sa;PWD="

set xmlDoc=Server.CreateObject("Microsoft.XmlDom")
xmlDoc.async = false
xmlDoc.preservewhitespace = false

sql = "SELECT * FROM test"
rS.open sql, conn, adOpenStatic, adLockReadOnly, adCmdText
rS.save xmlDoc, adPersistXML
rS.close

Set conn = nothing
Set rs = Nothing