AdWords ReportDownloadError.INVALID_VERSION. using .NET client library

Hi

I'm trying to get the .NET client library code samples to return a criteria performance report but can't get the code to function. I'm getting an error when clicking the "Download Criteria Report button" on the AdWords.Examples.CSharp.OAuth test page.
The error is as following:

System.Net.HttpWebRequest.GetResponse() +1399     Google.Api.Ads.AdWords.Util.Reports.ReportUtilities.DownloadReport(String downloadUrl, String postBody) in C:\Development\Projects\google.adwords.api\src\AdWords\Util\Reports\New\ReportUtilities.cs:183    [AdWordsReportsException: AdWordsReportsException: One or more AdWords Report download errors have occurred.     ReportDownloadError.INVALID_VERSION. (Error: ReportDownloadError.INVALID_VERSION, FieldPath: , Trigger: )    ]     Google.Api.Ads.AdWords.Util.Reports.ReportUtilities.DownloadReport(String downloadUrl, String postBody) in C:\Development\Projects\google.adwords.api\src\AdWords\Util\Reports\New\ReportUtilities.cs:204     Google.Api.Ads.AdWords.Util.Reports.ReportUtilities.GetReport() in C:\Development\Projects\google.adwords.api\src\AdWords\Util\Reports\New\ReportUtilities.cs:166     Google.Api.Ads.Common.Util.Reports.AdsReportUtilities.GetResponse() in C:\Development\Projects\google.adwords.api\src\Common\Util\Reports\AdsReportUtilities.cs:162     Google.Api.Ads.AdWords.Util.Reports.ReportUtilities.GetResponse() in C:\Development\Projects\google.adwords.api\src\AdWords\Util\Reports\New\ReportUtilities.cs:310     Google.Api.Ads.AdWords.Examples.CSharp.OAuth.Default.OnDownloadReportButtonClick(Object sender, EventArgs eventArgs) in C:\Development\Projects\google.adwords.api\examples\AdWords\csharp\oauth\Default.aspx.cs:100    [ApplicationException: Failed to download report.]     Google.Api.Ads.AdWords.Examples.CSharp.OAuth.Default.OnDownloadReportButtonClick(Object sender, EventArgs eventArgs) in C:\Development\Projects\google.adwords.api\examples\AdWords\csharp\oauth\Default.aspx.cs:104     System.Web.UI.WebControls.Button.OnClick(EventArgs e) +9712662     System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +204     System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +12     System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +15     System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +35 

   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1639 

What am i missing or doing wrong?

My main goal is to retrieve an XML feed that i can display on a webpage.

Regards 
Marianne

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