I am calling PageStoreService.asmx with the following parameters nad get the error listed below.

------- REQUEST -------

POST http://localhost:1703/WebServices/PageStoreService.asmx HTTP/1.1
Accept-Encoding: gzip,deflate
Content-Type: text/xml;charset=UTF-8
SOAPAction: "http://schemas.episerver.com/WebServices/v5/GetDefaultPageData"
User-Agent: Jakarta Commons-HttpClient/3.1
Host: localhost:1703
Content-Length: 731

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:v5="http://schemas.episerver.com/WebServices/v5/">
   <soapenv:Header/>
   <soapenv:Body>
      <v5:GetDefaultPageData>
         <!--Optional:-->
         <v5:parentPageLink>
            <v5:ID>3</v5:ID>
            <v5:WorkID>0</v5:WorkID>
            <!--Optional:-->
            <v5:RemoteSite></v5:RemoteSite>
         </v5:parentPageLink>
         <v5:pageTypeID>22</v5:pageTypeID>
         <!--Optional:-->
         <v5:selector>
            <!--Optional:-->
            <v5:LanguageBranch>en</v5:LanguageBranch>
         </v5:selector>
         <v5:access>Read</v5:access>
      </v5:GetDefaultPageData>
   </soapenv:Body>
</soapenv:Envelope>

------- RESPONSE -------

HTTP/1.1 500 Internal Server Error

Server: ASP.NET Development Server/9.0.0.0
Date: Tue, 06 Apr 2010 05:07:30 GMT
X-AspNet-Version: 2.0.50727
Cache-Control: private
Content-Type: text/xml; charset=utf-8
Content-Length: 965
Connection: Close

<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><soap:Fault><faultcode>soap:Server</faultcode><faultstring>System.Web.Services.Protocols.SoapException: Server was unable to process request. ---&gt; System.ArgumentNullException: Value cannot be null.
Parameter name: pageGuid
   at EPiServer.Core.PageObjectManager..ctor(Guid pageGuid, String pageLanguageBranch, Int32 workPageId, IPageObjectRepository repository)
   at EPiServer.Core.PageObjectManager..ctor(PageData pageData)
   at EPiServer.Core.PageData.ToRawPage()
   at EPiServer.WebServices.PageStoreService.GetDefaultPageData(PageReference parentPageLink, Int32 pageTypeID, LanguageSelector selector, AccessLevel access)
   --- End of inner exception stack trace ---</faultstring><detail /></soap:Fault></soap:Body></soap:Envelope>