Microsoft VBScript runtime error '800a13ba'

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HI there,

I am getting an error on my page which calls up a web service.

Microsoft VBScript runtime error '800a13ba'

Unknown runtime error: 'SearchQueryXML'

/SearchResults.asp, line 142
the code is as follows:
Dim oSOAP
Dim XmlDoc
Dim sSearchText

sSearchText = ""
sSearchText = "" & request.Form("search")

if sSearchText = "" Then
Response.Write("No search matches found.")
Else
'Create an object of Soap Client
Set oSOAP = Server.CreateObject("MSSOAP.SoapClient")
oSOAP.ClientProperty("ServerHTTPRequest") = True
'Initaialize the Web Service

oSOAP.mssoapinit("http://www.mywebsite.com.au/sitesearch/search.asmx?wsdl")
'oSOAP.mssoapinit("\\filer\home\user518\sitesearch \servicexml.xml")
'Invoke the Web Service
XmlDoc = oSOAP.SearchQueryXML("test")

set xmlDocument = Server.CreateObject("Microsoft.XMLDOM")
set xslDocument = Server.CreateObject("Microsoft.XMLDOM")

xmlDocument.loadxml(XmlDoc)
xslDocument.load("\\filer\home\user518\sitesearch\ SearchResults.xsl")

Response.Write(xmlDocument.transformNode(xslDocume nt))
End If
not sure if this is permissions or what? any help appreciated.